A Bush Tail is an animal native to Eternia. As their name implies, they have large, bushy tails.
They were squirrel-like creatures that lived up high in the trees. It had bulbous eyes and buckteeth.
When Beast Man was lamenting that had been thrown out of Snake Mountain by Skeletor, he ordered a Bush Tail to bring him down a pear like fruit and to 'make it snappy'. The creature did comply immediately, by throwing the fruit at Beast Man's furry face. Beast Man realized that was nothing without the power of Snake Mountain backing him up.