A vibrant blue poison dart frog, *Ranitomeya aetherea*, has been identified as a new species in the western Amazon.

The frogs are in the Ranitomeya genus and are tiny. All are only 15 to 17 millimetres in length—roughly the size of a dime.

As the world’s largest tropical rainforest, the Amazon is home to a staggering 3 million species. And a team of researchers ...