While idea may violate Occam’s razor, “it remains a speculative but logically open alternative,” says biologist Robert Endres ...

Survival of the fittest. Nature red in tooth and claw. The common view of natural selection is based solely on the individual: A trait allows an organism to out-compete its rivals and is thus passed ...

The earliest ancestors of all backboned animals, including humans, may have viewed the world with four eyes, not just two.

Biologists have debated the reason why Homo sapiens evolved a prominent lower jaw, but this unique feature may actually be a by-product of other traits shaped by natural selection ...