An extinct relative of the howler monkey may have been the first leaf-eating primate in South and Central America ...

Three tiny Purgatorius teeth found in Colorado are helping scientists trace how early primates evolved and spread across North America.

Tiny fossil teeth from Colorado are revealing new clues about the very first relatives of primates, including humans.

Sixty-six million years ago, a massive asteroid smashed into Earth. Life has undergone at least five mass extinctions in the ...

Thirteen million years ago, a group of medium-sized monkeys known for guarding their territory among the treetops with fearsome "howls" started doing something new. These monkeys, among the oldest ...

Key Facts 13.3-million–13.6 million-year-old fossils from an extinct relative of the howler monkey show signs of being the first leaf-eating ...

New research that decoded the evolution of mosquitoes’ feeding habits from DNA could shed light on the murky timeline of prehistoric human ancestors.

Mosquitoes haven’t always had a taste for human blood — partly because the tiny yet dangerous insects have been around a lot longer than humans. Pinpointing when mosquitoes shifted their preference to ...

Mosquitoes haven’t always had a taste for human blood — partly because the tiny yet dangerous insects have been around a lot longer than humans.

A newborn cannot speak, read, or walk. Yet moments after entering the world, the infant brain already responds to rhythm and melody. Researchers have found that babies detect patterns in timing and ...

Researchers discovered that a 215-million-year-old reptile started life on four legs and switched to two as an adult.