How Do Baby Birds Breathe Inside Their Eggs?
David De Lossy/Thinkstock
You might not realize it while you’re frying them sunny side up on a Sunday morning, but chicken eggs (and those of other birds, and reptiles) are some pretty sophisticated pieces of packaging.
Hard-shelled bird eggs contain albumen, or “egg white,” and a yolk. The fertilized egg cell, or embryo, develops within the yolk [...]
