The banana slug has a single lung, which has an external breathing pore, and it eats with its radula, a tongue-like body part that’s covered in rows of microscopic teeth. Like all gastropods ...

The males have a thin retractor muscle, the mechanism that normally moves the penis in and out of the slug’s body when needed, according to the study. However, the size doesn’t seem to matter ...

Intertwining together, the two slugs locked into a tight corkscrew formation ... From behind their large mantles (a section of their body right behind their head), two penises emerged, almost ...