Showing posts with label corvids. Show all posts
Showing posts with label corvids. Show all posts

Saturday, July 2, 2011

Hitchcockian Crows Spread the Word About Unkind Humans

http://www.livescience.com/14819-crows-learn-dangerous-faces.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+C2C-InTheNews+%28Feed+-+Coast+to+Coast+-+In+the+News%29

The common crow knows when you're out to get him — and he's likely to teach his friends and family to watch out for you, a new study finds.

In results that can only be described as Hitchcockian, researchers in Seattle who trapped and banded crows for five years found that those birds don't forget a face. Even after going for a year without seeing the threatening human, the crows would scold the person on sight, cackling, swooping and dive-bombing in mobs of 30 or more.

Read on...

Sunday, June 12, 2011

Washington cops under attack... by aggressive crows

Story Published: Jun 10, 2011 at 12:15 PM PDT

EVERETT, Wash. (AP) - Officers at a Seattle-area police department have found themselves in a flap with some unusual suspects: an angry flock of birds.

Crows have been attacking police in the parking lot of an Everett Police Department precinct station. They've been swooping down and dive-bombing the officers as they walk to and from their cars.

Lt. Bob Johns said he recently was flanked by the aggressive birds and "got zinged."

"They're like velociraptors," Johns said.

One officer used his siren to try to scare away the crows, but it didn't work. The birds responded by decorating his car with droppings, The Daily Herald reported.

State Fish and Wildlife Department biologist Ruth Milner said the birds are simply protecting baby crows that have been kicked out of the nest and are learning to fly. Adult crows are quite protective of their young - a common trait among larger birds and birds of prey.

"All they're doing is defending their nest," Milner said.

She noted crows also can recognize people's individual features. And they hold grudges.

"If your cops have done something that (the crows) perceive as a threat, they could be keying in on them because they're all wearing the same kind of uniform," Milner said.

In addition to the officers, at least a dozen city employees have encountered the angry crows, and some have complained about being attacked, city spokeswoman Kate Reardon said. But she said police and city workers have agreed to let the crows be, and wait out the aggression.

She said the employees will be cautious but can use umbrellas to defend themselves if need be.

http://www.kval.com/news/offbeat/123648944.html

Saturday, April 23, 2011

Lizard Point choughs under 24-hour guard

22 April 2011

Two choughs which arrived in Cornwall 10 years ago are being guarded around the clock by the RSPB and volunteers to protect their eggs.

The RSPB said the female had been seen sitting on a clutch of eggs in the nest in a cave at Lizard Point.

It is hoped the pair will be more successful than in 2010 when all four of their young died.

If the birds are successfully hatched and reared, the chicks are expected to fly off in early June.

The chough, a rare member of the crow family, has distinctive red legs and a long red bill.

There were more than 100 pairs in the county but the bird vanished after its food source dried up because of a decline in cliff-top grazing and the use of pesticides.

It eventually disappeared from the county in 1973, before returning to Cornwall in 2001.

In 2010, four eggs from the Lizard Point pair hatched but none of the fledglings survived.

Elsewhere in the county during the same year, there were another five breeding pairs in the county. Three pairs successfully raised nine young.

http://www.bbc.co.uk/news/uk-england-cornwall-13168611
(Via Liz R)

Wednesday, October 13, 2010

Druidic ravens at the Tower of London?

October 10, 2010

Beachcombing got an email this week from a Canadian history student. ‘Seeing as you seem to have knowledge of historical things quite off the beaten track I thought I’d seek some historic tourism advice. I’m a Canadian history student and over Christmas I’ll be travelling to London. I plan on a doing a couple of the regular sites… but beyond that I don’t want to be to ‘touristy’. I was wondering if you could suggest perhaps a few lesser known places in or around London that might be of particular interest.’

Beachcombing is not a great traveller, but he has a couple of haunts he regularly visits in the south of Britain. And so by way of an answer he thought that he’d write up three of his off-the-beaten-track must-visit lowland British spots starting with the Tower of London.

Yes, yes, there are few more ‘touristy’ magnets in the metropolis than the Tower. But most of the foreign nationals vomited off planes, boats, trains and buses go there for the Union Jack mugs or to be photographed with a Beefeater. Even the past-minded are after the frisson of Elizabethan executions. Beachcombing, on the other hand, couldn’t give a damn about those faux medieval towers and men in ruffs about to lose their noodle. He’s only interested in the ravens and their possible link with an ancient strata of British history.

For those who are not familiar with the ravens at the Tower let Beachcombing elaborate. About half a dozen ravens live at the Tower at any one time – essentially the pets of the authorities, they have clipped wings and their health is monitored by the powers that be.

There are various legends about said birds: one for example claims that they contain the spirits of Henry VIII’s wives and another and more important tale claims that if all the ravens leave the tower England will fall! The horror!

Now, make no mistake, the second legend is nonsense. In the Second World War, German bombs wiped out most of the raven population and the remaining two ravens sensibly flew away, clipped wings or otherwise. But Britain creaked on arthritically, surviving the Blitz, Lend Lease and even Clement Atlee (just).

However, where does the kingdom-falling legend come from? Well, there is a fascinating clue in a twelfth-century Welsh tale: Branwen daughter of Llyr. The story is a confusing almost hallucinogenic one, but for present purposes it should be enough to note that Bran, Branwen’s sister, has returned from an attack on Ireland with a handful of warriors. Branwen himself has been decapitated, but his head continues to interact with his men. Beachcombing should also mention that there is a door that the party-goers have been instructed not to open… 

And at the close of the seventh year they went forth to Gwales in Penvro. And there they found a fair and regal spot overlooking the ocean; and a spacious hall was therein. And they went into the hall, and two of its doors were open, but the third door was closed, that which looked towards Cornwall. ‘See, yonder,’ said Manawyddan, ‘is the door that we may not open’. And that night they regaled themselves and were joyful. And of all they had seen of food laid before them, and of all they had heard of, they remembered nothing; neither of that, nor of any sorrow whatsoever. And there they remained fourscore years, unconscious of having ever spent a time more joyous and mirthful. And they were not more weary than when first they came, neither did they, any of them, know the time they had been there. And it was not more irksome to them having [Bran’s head] with them, than if [Bran] had been with them himself. And because of these fourscore years, it was called ‘the Entertaining of the noble Head’. The entertaining of Branwen and Matholwch was in the time that they went to Ireland. One day said Heilyn the son of Gwynn, ‘Evil betide me, if I do not open the door to know if that is true which is said concerning it.’ So he opened the door and looked towards Cornwall and Aber Henvelen. And when they had looked, they were as conscious of all the evils they had ever sustained, and of all the friends and companions they had lost, and of all the misery that had befallen them, as if all had happened in that very spot; and especially of the fate of their lord. And because of their perturbation they could not rest, but journeyed forth with the head towards London. And they buried the head in the White Mount [the Tower of London], and when it was buried, this was the third goodly concealment; and it was the third ill-fated disclosure when it was disinterred, inasmuch as no invasion from across the sea came to this island while the head was in that concealment (Guest).

There is an unnerving and exciting parallel here. Bran’s warriors take his head to the Tower of London and bury it there. While Bran’s head remains  no invasion will come to the island, in other words the kingdom will not fall. At this point Beachcombing should add that ‘Bran’ in Welsh means ‘raven’.

What is the explanation for this strange, almost unaccountable link?

Well, three have been offered up in the last years.

The first and most dramatic is that  in ancient London there was a druidic cult site, a cult site that was remembered through the centuries in Welsh legend. Branwen arguably contains glimpses of historical events from as many as fifteen hundred years before.

A second explanation, favoured by the Tower Historian, Geoffrey Parnell is that the Branwen legend actually led, in the late nineteenth century, to ravens being brought to the Tower: someone who knew Branwen daughter of Llyr wanted to make Bran’s legend ‘come true’. And it is certainly striking that there are no written references to ravens at the tower before 1895. (There is a picture that may show a raven at the tower and that dates back to the early 1880s, but Beachcombing has his doubts.)

A third explanation, favoured by independent scholar Boria Sax, is that the ravens were introduced to the Tower at some point in the nineteenth century as ‘props’ to stories about executed nobles and queens. Boria Sax implicitly writes the whole Bran-Raven connection off as a coincidence.

Beachcombing would shake his head over the first explanation, however, much he would like it to be true. He loves the poetry of Geoffrey Parnell’s solution and he certainly has nothing against coincidences, aka Boria Sax. However, he wonders if a fourth explanation is not possible.

The lack of nineteenth-century references is striking. It is surely though credible that the birds had simply escaped notice in the writings concerning early Victorian London and that they may date back to an earlier period altogether.

Is it possible that, in fact, ravens had been kept at the Tower from the Middle Ages? The legend in the quoted passage from Branwen would then be an all too characteristic twelfth-century Welsh attempt to appropriate an important location in Norman London where Welsh visitors had seen ravens, perhaps associated with executions or killings or (thinking of the Normans) amputations. The legend that the ravens at the Tower were connected to the fall of the kingdom would then be of recent origin and come from readings of Branwen in modern times.

Beachcombing, if he had to choose, would go with Geoffrey Parnell’s explanation. But he is haunted by a sentence in Hudson’s Birds of London (1898): ‘For many years past two or three ravens have usually been kept at the Tower of London’. Beachcombing knows his way around Victorian bird books and has read Hudson’s metropolitan opus and trusts that careful and entertaining author. ‘Many years past’ must mean at least a generation (?), could it refer to a custom stretching back into the 1100s?

In any case Canadian History Student, go straight to the Tower, do not pass go and do not get distracted by the men in silly red uniforms. Look, instead, for those glorious flapping birds. Druids, Welsh fantasies, Victorian imposters? Make up your own mind and let Beachcombing know.

http://beachcombing.wordpress.com/2010/10/10/druidic-ravens-at-the-tower-of-london/

Druidic ravens at the Tower of London?

October 10, 2010

Beachcombing got an email this week from a Canadian history student. ‘Seeing as you seem to have knowledge of historical things quite off the beaten track I thought I’d seek some historic tourism advice. I’m a Canadian history student and over Christmas I’ll be travelling to London. I plan on a doing a couple of the regular sites… but beyond that I don’t want to be to ‘touristy’. I was wondering if you could suggest perhaps a few lesser known places in or around London that might be of particular interest.’

Beachcombing is not a great traveller, but he has a couple of haunts he regularly visits in the south of Britain. And so by way of an answer he thought that he’d write up three of his off-the-beaten-track must-visit lowland British spots starting with the Tower of London.

Yes, yes, there are few more ‘touristy’ magnets in the metropolis than the Tower. But most of the foreign nationals vomited off planes, boats, trains and buses go there for the Union Jack mugs or to be photographed with a Beefeater. Even the past-minded are after the frisson of Elizabethan executions. Beachcombing, on the other hand, couldn’t give a damn about those faux medieval towers and men in ruffs about to lose their noodle. He’s only interested in the ravens and their possible link with an ancient strata of British history.

For those who are not familiar with the ravens at the Tower let Beachcombing elaborate. About half a dozen ravens live at the Tower at any one time – essentially the pets of the authorities, they have clipped wings and their health is monitored by the powers that be.

There are various legends about said birds: one for example claims that they contain the spirits of Henry VIII’s wives and another and more important tale claims that if all the ravens leave the tower England will fall! The horror!

Now, make no mistake, the second legend is nonsense. In the Second World War, German bombs wiped out most of the raven population and the remaining two ravens sensibly flew away, clipped wings or otherwise. But Britain creaked on arthritically, surviving the Blitz, Lend Lease and even Clement Atlee (just).

However, where does the kingdom-falling legend come from? Well, there is a fascinating clue in a twelfth-century Welsh tale: Branwen daughter of Llyr. The story is a confusing almost hallucinogenic one, but for present purposes it should be enough to note that Bran, Branwen’s sister, has returned from an attack on Ireland with a handful of warriors. Branwen himself has been decapitated, but his head continues to interact with his men. Beachcombing should also mention that there is a door that the party-goers have been instructed not to open… 

And at the close of the seventh year they went forth to Gwales in Penvro. And there they found a fair and regal spot overlooking the ocean; and a spacious hall was therein. And they went into the hall, and two of its doors were open, but the third door was closed, that which looked towards Cornwall. ‘See, yonder,’ said Manawyddan, ‘is the door that we may not open’. And that night they regaled themselves and were joyful. And of all they had seen of food laid before them, and of all they had heard of, they remembered nothing; neither of that, nor of any sorrow whatsoever. And there they remained fourscore years, unconscious of having ever spent a time more joyous and mirthful. And they were not more weary than when first they came, neither did they, any of them, know the time they had been there. And it was not more irksome to them having [Bran’s head] with them, than if [Bran] had been with them himself. And because of these fourscore years, it was called ‘the Entertaining of the noble Head’. The entertaining of Branwen and Matholwch was in the time that they went to Ireland. One day said Heilyn the son of Gwynn, ‘Evil betide me, if I do not open the door to know if that is true which is said concerning it.’ So he opened the door and looked towards Cornwall and Aber Henvelen. And when they had looked, they were as conscious of all the evils they had ever sustained, and of all the friends and companions they had lost, and of all the misery that had befallen them, as if all had happened in that very spot; and especially of the fate of their lord. And because of their perturbation they could not rest, but journeyed forth with the head towards London. And they buried the head in the White Mount [the Tower of London], and when it was buried, this was the third goodly concealment; and it was the third ill-fated disclosure when it was disinterred, inasmuch as no invasion from across the sea came to this island while the head was in that concealment (Guest).

There is an unnerving and exciting parallel here. Bran’s warriors take his head to the Tower of London and bury it there. While Bran’s head remains  no invasion will come to the island, in other words the kingdom will not fall. At this point Beachcombing should add that ‘Bran’ in Welsh means ‘raven’.

What is the explanation for this strange, almost unaccountable link?

Well, three have been offered up in the last years.

The first and most dramatic is that  in ancient London there was a druidic cult site, a cult site that was remembered through the centuries in Welsh legend. Branwen arguably contains glimpses of historical events from as many as fifteen hundred years before.

A second explanation, favoured by the Tower Historian, Geoffrey Parnell is that the Branwen legend actually led, in the late nineteenth century, to ravens being brought to the Tower: someone who knew Branwen daughter of Llyr wanted to make Bran’s legend ‘come true’. And it is certainly striking that there are no written references to ravens at the tower before 1895. (There is a picture that may show a raven at the tower and that dates back to the early 1880s, but Beachcombing has his doubts.)

A third explanation, favoured by independent scholar Boria Sax, is that the ravens were introduced to the Tower at some point in the nineteenth century as ‘props’ to stories about executed nobles and queens. Boria Sax implicitly writes the whole Bran-Raven connection off as a coincidence.

Beachcombing would shake his head over the first explanation, however, much he would like it to be true. He loves the poetry of Geoffrey Parnell’s solution and he certainly has nothing against coincidences, aka Boria Sax. However, he wonders if a fourth explanation is not possible.

The lack of nineteenth-century references is striking. It is surely though credible that the birds had simply escaped notice in the writings concerning early Victorian London and that they may date back to an earlier period altogether.

Is it possible that, in fact, ravens had been kept at the Tower from the Middle Ages? The legend in the quoted passage from Branwen would then be an all too characteristic twelfth-century Welsh attempt to appropriate an important location in Norman London where Welsh visitors had seen ravens, perhaps associated with executions or killings or (thinking of the Normans) amputations. The legend that the ravens at the Tower were connected to the fall of the kingdom would then be of recent origin and come from readings of Branwen in modern times.

Beachcombing, if he had to choose, would go with Geoffrey Parnell’s explanation. But he is haunted by a sentence in Hudson’s Birds of London (1898): ‘For many years past two or three ravens have usually been kept at the Tower of London’. Beachcombing knows his way around Victorian bird books and has read Hudson’s metropolitan opus and trusts that careful and entertaining author. ‘Many years past’ must mean at least a generation (?), could it refer to a custom stretching back into the 1100s?

In any case Canadian History Student, go straight to the Tower, do not pass go and do not get distracted by the men in silly red uniforms. Look, instead, for those glorious flapping birds. Druids, Welsh fantasies, Victorian imposters? Make up your own mind and let Beachcombing know.

http://beachcombing.wordpress.com/2010/10/10/druidic-ravens-at-the-tower-of-london/

Sunday, May 30, 2010

Crows attack Berlin residents

Scenes reminiscent of Alfred Hitchcock's "The Birds" have prompted police to post warning notices around the city at blackspots.

"Attacks happen during breeding season, and crows have a natural instinct to protect their nests and young and to keep people at distance," Anja Sorges, the head of the Berlin office of the Nature and Biodiversity Conservation Union told Germany's Spiegel magazine.

Sometimes the crows have drawn blood. On Wednesday a cyclist pedalling past the archives of the old Stasi secret police in East Berlin was dislodged from the saddle by the feathered attackers, which then continued to peck at him ferociously on the ground.

He needed medical attention. "Their beaks aren't so small," he said.

Near the city's Reichstag parliament building, a crow pecked at the back of man's head as he walked along a pathway.

But there is an end in sight: experts say the attacks will peter out and then finish altogether in a matter of weeks when the crow chicks are ready to flee the nest.

http://www.telegraph.co.uk/news/worldnews/europe/germany/7777096/Crows-attack-Berlin-residents.html

Wednesday, April 21, 2010

Clever crows can use up to three tools (Video)

April 21, 2010 3:20 PM

Researchers have found that New Caledonian crows are capable of using three tools in succession in order to reach food.


Boffins from the University of Auckland set up a test to demonstrate the tool-using prowess of crows which has been seen in the wild.

In their experiment birds had to work out how to access food they could not initially reach.

This had to be done by first releasing a short string which was attached to a perch, and using this to reach a longer stick from behind bars.

The longer stick was then used to retrieve a scrap of food from within a perspex box… the scientists are now hoping the birds will write up the experiment themselves.

Professor Russell Gray, from the University of Auckland, said: "The crows needed to understand they needed the short tool on the piece of string to get the long tool, and then use the long tool to get the food."

Writing in the Proceedings of the Royal Society B, the researchers added: "This innovative use of established behaviours in novel contexts was not based on resurgence, chaining and conditional reinforcement.

"Instead, the performance was consistent with the transfer of an abstract, causal rule: ‘out-of-reach objects can be accessed using a tool’.

"This suggests that high innovation rates in the wild may reflect complex cognitive abilities that supplement basic learning mechanisms."


LINKS
University of Auckland

http://newslite.tv/2010/04/21/clever-crows-can-use-up-to-thr.html

Friday, February 26, 2010

Brainy Crows Finally Stumped by Intelligence Test

By Brandon Keim February 24, 201

Maybe they’re not as smart as we thought: The New Caledonian crow, having passed so many other tests of animal cognition, has finally flunked an exam.

New Caledonian crows are valedictorians among corvids, a family of birds that includes ravens, jays and magpies. They’ve wowed scientists with their cognitive powers, even using wire as a food-fetching tool.

On one classic cognition test — retrieving a piece of food tied to a string — corvids perform so well that some researchers thought they didn’t just learn through rote trial and error, but envisioned problems in their head.

In a study published Feb. 22 in Public Library of Science ONE, researchers added a twist: They ran the string through a hole in a plywood platform. Crows could only see the food when directly above the hole. When they pulled back on the string, they’d lose sight of it. If they really did have a mental image of the task, it wouldn’t be a problem.

Twelve crows took the test: four who’d practiced on the old food-on-a-string setup, four who’d never seen it, and four who’d never seen it but could watch their reflection in a mirror.

Crows from the first group succeeded, but only after many attempts. Only one of the second group passed, also with difficulty. Two crows from the third group passed. It wasn’t the ace performance usually seen in crows.

“These results are not consistent with the hypothesis that the crows built a mental scenario,” wrote the researchers. “Our results raise the possibility that spontaneous string pulling in New Caledonian crows may not be based on insight but on operant conditioning mediated by a perceptual-motor feedback cycle.”

In other words, the crows relied on a simple trial-and-error approach. But the researchers did acknowledge that their sample size was limited, and that depth perception could be skewed in a confusing way by the experimental setup.

If nothing else, the crows did far better than finches. And even if they’re not good with spatial relationships, they’re certainly fast learners.

Images: 1) New Caledonian Crows on the old experimental setup at left, and on the new apparatus at right. Credit: University of Auckland. 2) Schematic of the new test design. Credit: University of Auckland.

http://www.wired.com/wiredscience/2010/02/crow-intelligence/#ixzz0gdVHkpHD
(Submitted by Liz R)

Tuesday, January 26, 2010

If you think a crow is giving you the evil eye…

08:00 26 January 2010 by Bob Holmes

Video: Crows recognise people's faces

Wild crows can recognise individual human faces and hold a grudge for years against people who have treated them badly. This ability – which may also exist in other wild animals – highlights how carefully some animals monitor the humans with whom they share living space.

Field biologists have observed that crows seem to recognise them, and a few researchers have even gone to the extreme of wearing masks when capturing birds to band (or "ring") them, so that they could later observe the birds without upsetting them. However, it was unclear whether the birds distinguish people by their faces or by other distinctive features of dress, gait or behaviour. To find out, John Marzluff at the University of Washington in Seattle and colleagues donned a rubber caveman mask and then captured and banded wild American crows.

Whenever a person wearing the same mask approached those crows later, the birds scolded them loudly. In contrast, they ignored the same person wearing a mask of former US Vice-President Dick Cheney, which had never been worn during banding. "Most of the time you walk right up to them and they don't care at all," says Marzluff.

Long memories

The birds' antipathy to the caveman mask has lasted more than three years, even though the crows have had no further bad experiences with people wearing it. The crows responded less strongly to other details of a person's dress, such as the presence of a hat or a coloured armband.
In a second experiment, Marzluff's team prepared six masks from casts of people's faces, then wore different masks to capture crows in each of four locations. In each case, they found, the crows recognised and scolded whichever mask they had seen when they were captured, and ignored the others.

This shows that crows pay close attention to humans, noting which individuals pose a threat and which do not, says Doug Levey of the University of Florida in Gainesville, who was not part of the team.

"We may think they are just bystanders minding their own business – but we are their business," he notes. "It's likely that they're incredibly perceptive of the dog and cat components of their environment, as well."

Journal reference: Animal Behaviour, DOI: 10.1016/j.anbehav.2009.12.022

http://www.newscientist.com/article/dn18429-if-you-think-a-crow-is-giving-you-the-evil-eye.html
(Submitted by Tim Chapman)

Sunday, January 17, 2010

Day later, mystery behind death of 58 crows unsolved

By Mehul Jani and Ruturaj Jadav
Posted On Sunday, January 17, 2010 at 02:21:12 AM

A day after 58 crows were found dead in Gandhinagar, their deaths still remain a mystery. The forest department had sent three carcasses to the Anand Government Laboratory for a detailed report.

The department was bewildered, when they came across 58 crows falling dead from a peepal tree at Sector 28 in Gandhinagar.

No abnormality has been found in the system of one of the carcasses during the post-mortem examination. However, the post-mortem report of the other two showed traces of infected food.

Superintendent of Kankaria Zoo Dr R K Sahu said, “Besides infected food, the birds could have dropped dead due to cold shock.”

“The mercury has plummeted in the past couple of days. This could result in cold shock, which causes blood circulation to stop, leading to death,” he added.

ANALA director Madhu Menon said, “Crows search for food in groups. As these crows have died at one spot within a few minutes, they might have eaten infected food or something poisonous.”

Conservationist Aditya Roy said, “One reason can be common disease or infection in this group. It has happened in the past in central India and south India. Huge number of vultures had died due to avian malaria in these two regions.”

Meanwhile, Conservator of Forest Anil Johri said, “We are waiting detailed reports from Anand to ascertain the reason behind the death of crows.”

Crows search for food in groups. As these crows have died at one spot within a few minutes, they might have eaten infected food or something poisonous

– Madhu Menon, ANALA director


http://www.ahmedabadmirror.com/article/3/2010011720100117022112467e4266c83/Day-later-mystery-behind-death-of-58-crows-unsolved.html
(Submitted by Caty Bergman)