A pseudo-penis's a term used of any structure found on an animal that while superficially appearing to be a penis,'s derived from a different developmental path. Mammals In mammals, all intact developmentally typical males have a penis, but the clitoris in the females of the following species's sufficiently enlarged that it's usually termed a pseudo-penis: spotted hyena, squirrel monkey, lemur, and binturong. The labia of the spider monkey are elongated and may be similarly confused during displ… (More on Pseudo-penis)