People have been eating eggs for centuries. Records as far back as 1400 B.C. show that the Chinese and Egyptians raised birds for their eggs. The first domesticated birds to reach the Americas arrived in 1493 on Christopher Columbus' second voyage to the New World. Today, the two most common types of eggs people eat around the world are chicken and ostrich eggs.
Most food stores in the United States sell only chicken eggs, but there are many varieties of chicken eggs to choose from—white, brown, organic, cage free, vegetarian, omega 3 fatty acid enriched, and more. The bottom line is that buying eggs is not as simple as it used to be. (A Consumer's Guide to Eggs