Geese are known to fly heads at unusual heights, orbiting the peaks of some of the highest mountains in the world.
Birds were spotted by climbers deprived of oxygen, climbing Mount Everest for decades, but it was never fully understood how they handled it.
Now, scientists who raised the goose as their own "children" have discovered the secret of their success at an altitude that can see them rise to 29,500 feet, lies in the ability to cool their blood to lower temperatures and energy conservation.
Experiments conducted at the University of British Columbia tied miniature backpacks to birds and trained them to fly in oxygen-reduced wind tunnels to test their abilities.
Researchers raised geese and trained them to fly in a wind tunnel (pictured) while wearing backpacks and earphones, to measure their vital signs. They then discovered that the birds could lower their blood temperature and metabolism to maximize and conserve energy
Experiments conducted at the University of British Columbia tied miniature backpacks (pictured) to birds as well as hats to track their vital organs. They were then trained to fly in a wind tunnel to test their abilities.
Jessica Mayr worked at the university when they worked on the project and became surrogate mothers to the birds. She bought goose eggs, raised them as their surrogate mother, and when they hatched, began training animals to fly indoors
Chickens are bred by scientists for the sole purpose of experiment and understanding the secrets of their flight  This includes the account of the team of the fearless explorer Edmund Hillary, who in 1953, while in the so-called "zone of death", believed he saw a goose fly over the top ” class=”blkBorder img-share” />
Jessica Meir worked on the project and bought 19 goose eggs and raised them as a surrogate mother.
Then, when they hatched, she and a colleague trained the animals to fly indoors.
This, the researchers say, is not something that naturally came to the geese.
"They didn't really understand it. Some would turn and try to escape the wind. They would be drawn into their own feathers. It was a disaster, "Ms. York, now at the University of Texas at Austin, told The Times.
Current accounts state that birds were observed up to 29,500 feet (9,000 meters).
perfectly captures the account of those who climb Everest with explorer Edmund Hillary In 1953, while in the so-called "death zone", George Lowe believed he saw a goose fly over the top while struggling to
Scientific experiments tracking birds have carried them up to 24,000 feet (7,290 m).
Research Findings, publ. eLife shows that they adjust their metabolism to cope where the air is so thin.
They found that six of the seven birds that can fly in the tunnel are capable of flying at moderately low levels. oxygen levels equal to about 18,000 feet (5,500 m).
Three of the birds were also prepared to fly in severely low oxygen conditions, at an altitude of about 29,500 feet (9,000 m), the high altitude recorded in history.
Researchers measure the heart rate of birds, the rate of oxygen consumption and the production of carbon dioxide, as well as blood temperature.
The geese were trained and accustomed to the unusual hats and gadgets they needed to wear (pictured) to track their inner vital signs
Researchers buy goose eggs, raise them as their surrogate mother, and when hatching, start training animals to fly indoors (pictured). This, researchers say, is not something that has naturally reached the geese
Modern accounts of various over time, the birds claimed that the birds were monitored up to 29,500 feet (9,000 m), while the projects tracked them up to 24,000 feet (7,290 m) and the wind tunnel reproduced these conditions
Cute balls of fluffy ne a (pictured) were trained to wear the equipment so that researchers could understand more about their biology
Training (pictured) and bird studies have established that geese have the natural ability to manipulate their metabolism and blood temperature and this allows them to make high altitude trips
IS A HILLER REPAIRED?
Sir Edmund Percival Hillary is a climber in New Zealand and exploring.
On May 29, 1953, climber Hillary and Nepalese Sherpa Tenzing Norgai became the first climber to confirm that he had reached the summit of Everest.
After his incredible achievement, Hilary dedicated her life to helping the Sherpa people of Nepal.
He died in 2008 at the age of 88.
They were surprised to find that the heart rate remained about the same as when flying at lower altitudes, but they lowered their blood temperature and metabolism.
"We were surprised to find that their heart rate during low-oxygen flights was no higher than during normal-oxygen flights," Ms. York said.
"In addition, we have seen that the temperature in their veins decreases during simulated flights, which are thought to significantly increase the amount of oxygen they can carry in their blood.
"Our data suggest that animals are able to reduce their metabolism in accordance with reduced oxygen levels without evidence of oxygen limitation."
Ms. York and Dr. Meir, now an astronaut NASA, and due to go to the ISS at the end of the month, had to say goodbye to their geese, which were adopted by a wild bird lover in Vancouver.
The geese were born for this study and their life and training allowed scientists to extract one of the most peculiar inventions of bird anatomy