If you’ve always thought echidnas and platypuses were distant cousins who went their separate ways on land and water, think again. A single fossilized arm bone, found in a remote corner of ...

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, ...

These days, mammals can use their forelimbs to swim, jump, fly, climb, dig and just about everything in between, but the question of how all that diversity evolved has remained a vexing one for ...