Atretochoana — Specie of limbless amphibians known as the "penis snake" that was once thought to be extinct until its rediscovery in 2011

Although it is not a snake, it has been called various common names in the media such as "penis snake", "man-aconda", and "floppy snake", owing to its visual similarity to the human penis.[9][10]

first off, thank you, Wikipedia, for including "man-aconda" in its cited terms. really going the extra mile.

but also, it's wild that thing isn't even a snake. just another limbless amphibian with unknown breathing mechanisms, hiding in the rainforest. way cooler than I thought.