Penguin hemoglobin evolved to meet oxygen demands of diving

Webbed feet, flipper-like wings and unique feathers all helped penguins adapt to life underwater. But by resurrecting two ancient versions of hemoglobin, a research team has shown that the evolution of diving is also in their blood, which optimized its capture and release of oxygen to ensure that penguins wouldn't waste their breath while holding it.

from Top Environment News -- ScienceDaily https://ift.tt/3d46SYE