If you pick up or bother a sea cucumber, it will squirt water from its rear hole, and it may even eject its innards. This is a defense mechanism that sea cucumbers use to protect themselves from predators.

Do sea cucumbers squirt ink?

They can also secrete acid, ink or slime (depending on the species). Although sea cucumbers can also contain toxins, they have an additional weapon—when threatened, they can spew their internal organs out of their anus.

What comes out of sea cucumber?

When threatened, a sea cucumber contracts its body, tears a hole in an interior wall, and shoots a few of these noodles out its anus. The threads immediately stretch when they hit seawater, growing up to 20 times their original length before stiffening. They also become sticky when they reach a surface.