How Birds-To-Be Get Oxygen Inside Eggs

A chick embryo, sealed inside its egg, must find a way to get oxygen without its mom — and long before it has working lungs.

Unlike humans, bird embryos don’t have an oxygen pipeline from their mothers. They develop inside eggs in a nest. Skunk Bear’s latest video explains why these pre-hatchlings don’t suffocate.

(Image credit: Adam Cole/NPR’s Skunk Bear)