So many extinction-level events happened in ancient times, it is a wonder anything survived. These the ones that killed the ...

Analysis of the fossil suggests that the only two egg-laying mammals, platypuses and land-based echidnas, both descended from ...

By analyzing the arrangement of vertebrae in the spines of nearly 400 species of tetrapods—a group of animals with four limbs ...

Chimpanzees are often cast as a mirror to our darkest tendencies, embodying violence, territoriality and power struggles. In ...

We may have gotten the evolutionary origins of the echidna backward, as new research suggests its ancestors probably lived in ...

Scientists have discovered 1.5-million-year-old standardized bone tools in Tanzania, pushing back the timeline of early ...

A controversial idea suggests the ancestors of echidnas were more like the platypus. For the first time, fossil evidence ...