Chimera
[After Chimera, a fire-breathing female monster in Greek mythology who had a lion's head, a goat's body, and a serpent's tail. (sounds awfully unpleasant)
From Greek khimaira(she-goat,
ultimately from the Indo-European root ghei- (winter) that is the ancestor of words such as chimera (literally a female animal that is one winter, or one year old), hibernate, and the Himalayas, from Sanskrit him (snow) + alaya (abode).]

It's the she-goat who's done it again. (sigh... ) the scapegoat.
(though that word is defined as 'bad or inferior member of any group', so that word is more casual about the sexes))