Add Yahoo as a preferred source to see more of our stories on Google. Scientists now recognize more than a dozen species in the Homo genus. So what, exactly, was the first human species? The answer, ...

Modern human beings are the ultimate apex species, exerting dominance over our environment in a way that no other animal ever ...

(Reuters) -Researchers have unearthed tooth fossils in Ethiopia dating to about 2.65 million years ago of a previously unknown species in the human evolutionary lineage, one that lived in the same ...

Humans may be responsible for the extinction of nearly 1,500 species of birds, the majority of which have been wiped out since the end of the last ice age. Nearly all these extinctions are thought to ...