Can you picture an animal small enough to comfortably sit atop your fingernail?

It may sound like work of fiction, but such an animal actually existsthe Brazilian flea toad.

Don’t be fooled by the name though.

Brachycephalus pulex

It is neither a flea nor a toad, but, in fact, a frog.

Due to its size, it is believed to be the smallest amphibian and smallest vertebrate in the world.

The smallest individual measured in the study was 6.45 millimeters long (0.25 in).

Brachycephalus pulex

Herpetologist Mirco Sole first learned about the Brazilian flea toad back in 2011.

For example, their feet have just two toes instead of the typical five.

[It] would really challenge morphology and physics, Sole toldScience News.

Brazilian flea frog

Photo: Dias, I; Medeiros, T; Vila Nova, M; Solé M viaWikimedia Commons(CC BY 4.0)