Twice a year, Bar-headed Geese migrate over the Himalayas, the tallest mountains on the planet. Flying requires ten to twenty times more oxygen than resting. Yet at this altitude, there’s only half to one-third of the oxygen. Animal physiologist Jessica Meir says these amazing birds…

The Emperor Penguin is the largest penguin on the planet. It’s also the deepest and longest underwater diver. Biologist Jessica Meir, pictured here, traveled to Antarctica to study their amazing feats. She learned that Emperor Penguins can hold relatively more oxygen in their bodies than…