Slate reports on animal onanism

Slate's culture editor John Swansburg says,

Catfap
Just posted an
article by my colleague Dan Engber on the subject of animal
masturbation. It turns out that onanism has been observed throughout the
animal kingdom: dogs do it, cats do it, horses do it, turtles do it,
birds love to do it. Some moose can even bring themselves to sexual
climax by just rubbing their antlers on a tree (!).

Dan's article
explores the scientific explanations for why animals might have evolved
this behavior. There's also an accompanying video slide show — it turns
out folks are very fond of posting footage of their frisky pets, or of
the strange activity they saw a koala enjoying at the zoo…

Hands or Paws or Anything They GotMasturbation in the animal kingdom.