The classic thought experiment about a horse-sized duck and a hundred duck-sized horses is more than a joke. It captures a ...

For more than a century, biologists assumed that the bony plates embedded in the skin of lizards – like natural chain mail – were an ancient feature that some lineages inherited and others later lost.

When I got my first look at Boulenger’s backpack frog, I thought the poor thing was suffering from the world’s most unpleasant skin disease. The frog in this video appears to be wearing a cluster of ...