Australia and South America weren't always so separate. At one time, many millions of years ago, these two continents were connected, along with others, in the southern supercontinent of Gondwana.

Poison frogs are small and brightly colored amphibians that originate from Central and South America. As suggested by their name, these frogs can release highly toxic chemicals from their skin, which ...

Poison frogs appear to have built their chemical defenses gradually: related frogs store low to moderate levels of ...

This newly discovered poison frog may represent an evolutionary step on the pathway towards developing brilliant warning coloration associated with other poison dart frogs. A small reddish-brown frog ...