Birds have evolved to fit particular environments. Eggs have evolved along with the birds. The eggs that birds will lay this spring will vary in shape and color to facilitate successful hatching in a ...

Fish and amphibian eggs are soft and unshelled and must float in the water in order to get enough oxygen and expel their ...

Many species of birds are nesting and laying eggs nearly a month earlier than they did 100 years ago in the Chicago area and researchers believe climate change is behind it. Those were among the ...