|Images: Nick Hobgood|
Because sometimes two tentacles are not nearly enough.
|Image: Elias Levy|
Video: George Hodge
And, like most cowries, they have a huge mantle that can be hidden away inside their shell when danger lurks, or rolled out so it rises up the sides of the smooth shell and covers it up entirely.
Maybe they simply enjoy being a kind of bizarre, inverse pin cushion? I mean, soft, fleshy pins sticking out of a hard shell? Maybe they're a bunch of practical jokes enjoying their retirement?