The protein necessary to create a chicken eggshell can only be produced by hens. Therefore, the chicken had to have come first.
The dragonfly is nature's best hunter, making a kill 97% of the time. Lions, by comparison, are successful 20% of the time.
In 2005, a couple of primate researchers taught a group of chimpanzees the concept of money. Within a couple of days, the chimps began engaging in prostitution.
At some point the first chicken was hatched. The bird that laid the egg wan scientifically not classifiable as a chicken. So the question is was that chicken's birth egg a chicken egg or something else?