Evidence has been uncovered that connects the ichthyosaur with its transition from land to sea.
The leopard frog with a blue hue is a 1 in 300,000 rarity.
Creature's distinctive color and call make is stand out.
Cane toads that go where no cane toad has gone before pave the way for more timid toads to rapidly take over new territories, say researchers.
A boomerang-headed amphibian often met its doom in the jaws of a reptilian fin-backed mammalian ancestor.
Two species enter; one species leaves. Don't bet against the beetle.
The St. Louis Zoo has successfully bred Ozark hellbenders for the first time in captivity.