But don't get down on yourself for not being as cute as a poison dart frog or as stunning as an Arctic fox. There are reasons why these critters are so gorgeous — most have to do with evolution.

Beautiful but deadly: the perfect words to describe the poison dart frog. These amphibians gain their striking name from the ...

With its bright blue body mottled with black, the cobalt poison dart frog is hailed as a “jewel of the rainforest” for its beauty. However, as its name suggests, such frogs in nature possess a ...