When you buy through links on our articles, Future and its syndication partners may earn a commission. Echidnas may have evolved from a water-dwelling ancestor in an unusual evolutionary event, ...

This mammal, about the size of an opossum, had a mix of strange characteristics that haven't been seen together before. It highlights evolutionary strangeness that can arise when evolution occurs in ...

Despite being mammals, these remarkably cancer-resistant animals share a lot in common with cold-blooded species.