When we think about all of the living things on Earth, we immediately see how different we all are from each other.  Many of these traits that might seem bizarre to us, evolutionarily speaking, have a tremendous amount to do with the survival.  Many traits have been selected for by the opposite sex, because it will help the passing on of their design information.

One very amazing example of this is the Widowbirds that live in the grasslands of southern and eastern Africa.  During the non-mating season, the males and females look very similar to one another.  Once breeding season begins, More >