Twins are pretty rare, accounting for just 3% of births in the U.S. these days. But new research shows that for primates 60 ...

Twins are pretty rare, accounting for just 3% of births in the US these days. But new research shows that for primates 60 million years ago, giving birth to twins was the norm.

Fossils of the oldest saber-toothed predator are helping researchers understand the evolution of early mammal relatives called gorgonopsians and our shared origins in the therapsid group.

A nearly gapless genome sequence of the echidna, an egg-laying mammal with multiple sex chromosomes, helps researchers to track genomic reorganization ...

Our recent research suggests that twins were actually the norm much further back in primate evolution ... as possible across the mammalian family tree and then use mathematical algorithms ...

Our recent research suggests that twins were actually the norm much further back in primate evolution ... as possible across the mammalian family tree and then use mathematical algorithms to ...

Our recent research suggests that twins were actually the norm much further back in primate evolution, rather than an unusual ... size of as many species as possible across the mammalian family tree ...