Every spring, colorful eggs show up in Easter egg hunts, and hard-boiled eggs grace Seder plates at Passover. But besides serving as an oval canvas for egg decorators and a symbol of rebirth and fertility, avian eggs are known for their diversity in shape and size.
For instance, kiwi eggs take up about 25% of the mother's body, making it the largest egg of any bird, relative to its mother's body size, according to researchers at the American Museum of Natural History (AMNH) in New York City. But laying an enormous egg has its benefits: The chick is almost ready to live on its own once it hatches.
