Emperor penguins "time" their dives by the number of flaps they can manage with their wings.
This is according to a new study published in the Journal of Experimental Biology.
It aimed to show how the birds reached the "decision" that it was time to stop feeding and return to the surface to breathe.
Tracking the birds revealed that they flapped their wings, on average, 237 times on each dive.
The study was led by Dr Kozue Shiomi, from the University of Tokyo, Japan.
Dr Shiomi and his team think that the penguins' decision to end their foraging dive and return to the surface is constrained by how much power their muscles can produce after every pre-dive breath. This "flying" motion propels the birds forwards, allowing them to swim quickly through the water, gulping fish.
Using data collected from diving penguins on previous field trips, the team analysed the patterns of more than 15,000 penguin dives.
They studied 10 free-ranging birds and three birds that were foraging through a hole in the ice.
Read more here ...
Showing posts with label emperor penguins. Show all posts
Showing posts with label emperor penguins. Show all posts
Saturday, December 10, 2011
Monday, September 5, 2011
Wayward penguin Happy Feet released
The wayward emperor penguin known as Happy Feet is back home in Antarctic waters after an extended sojourn spent capturing hearts in New Zealand.
Speaking from a satellite phone aboard the research vessel Tangaroa, Wellington Zoo veterinarian Lisa Argilla said Happy Feet's release went remarkably smoothly given that the boat was being tossed about in 25ft swells in the unforgiving Antarctic Ocean.
Ms Argilla said crew members from the boat carried the penguin inside his custom-built crate to the stern of the ship for his final send-off. The crew had already cut the engines and put in place a canvas slide that they soaked with water from a hose.
But when they opened the door of the crate, the penguin showed no interest in leaving. "I needed to give him a little a tap on his back," Ms Argilla said. The penguin slipped down the slide on his stomach, bottom first, she said. He resurfaced about 6ft from the boat, took a look up at the people aboard and then disappeared beneath the surface.
"I was really happy to see him go," Ms Argilla said. "The best part of my job is when you get to release animals back into the wild where they are supposed to be."
The 3ft-tall aquatic bird was found on June 20 on Peka Peka Beach, about 40 miles north-west of New Zealand's capital, Wellington. It had been 44 years since an emperor penguin was last spotted in the wild in New Zealand.
At first, conservation authorities said they would wait and let nature take its course with the penguin. But it soon became clear the bird's condition was deteriorating, as he scooped up beaks full of sand and swallowed, probably mistaking it for snow, which emperor penguins eat for its moisture when in Antarctica.
With the world watching, authorities finally took action, moving the penguin to Wellington Zoo four days after he was discovered. At the zoo, the three-year-old bird underwent numerous stomach flushing procedures to remove sand from his digestive system. He was given a makeshift home in a room that zoo staff kept filled with a bed of ice so he would not overheat.
A local television station, TV3, set up a webcam and streamed images of the bird round the clock. Soon, Happy Feet had a quarter of a million followers. And, perhaps befitting of a bird from the internet age, those followers will be able to keep track of him for a while longer. Happy Feet has been fitted with a GPS tracker and his movements will be posted online. Ms Argilla expects the tracker to fall off the next time the bird malts.
Happy Feet was released into the ocean south of New Zealand on Sunday, more than two months after he came ashore on a beach nearly 2,000 miles from home and became an instant celebrity.
Speaking from a satellite phone aboard the research vessel Tangaroa, Wellington Zoo veterinarian Lisa Argilla said Happy Feet's release went remarkably smoothly given that the boat was being tossed about in 25ft swells in the unforgiving Antarctic Ocean.
Ms Argilla said crew members from the boat carried the penguin inside his custom-built crate to the stern of the ship for his final send-off. The crew had already cut the engines and put in place a canvas slide that they soaked with water from a hose.
But when they opened the door of the crate, the penguin showed no interest in leaving. "I needed to give him a little a tap on his back," Ms Argilla said. The penguin slipped down the slide on his stomach, bottom first, she said. He resurfaced about 6ft from the boat, took a look up at the people aboard and then disappeared beneath the surface.
"I was really happy to see him go," Ms Argilla said. "The best part of my job is when you get to release animals back into the wild where they are supposed to be."
The 3ft-tall aquatic bird was found on June 20 on Peka Peka Beach, about 40 miles north-west of New Zealand's capital, Wellington. It had been 44 years since an emperor penguin was last spotted in the wild in New Zealand.
At first, conservation authorities said they would wait and let nature take its course with the penguin. But it soon became clear the bird's condition was deteriorating, as he scooped up beaks full of sand and swallowed, probably mistaking it for snow, which emperor penguins eat for its moisture when in Antarctica.
With the world watching, authorities finally took action, moving the penguin to Wellington Zoo four days after he was discovered. At the zoo, the three-year-old bird underwent numerous stomach flushing procedures to remove sand from his digestive system. He was given a makeshift home in a room that zoo staff kept filled with a bed of ice so he would not overheat.
A local television station, TV3, set up a webcam and streamed images of the bird round the clock. Soon, Happy Feet had a quarter of a million followers. And, perhaps befitting of a bird from the internet age, those followers will be able to keep track of him for a while longer. Happy Feet has been fitted with a GPS tracker and his movements will be posted online. Ms Argilla expects the tracker to fall off the next time the bird malts.
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