Supposedly in the Amazon there lives a beast the natives fear. They have a name for it: Mapinguari. They believe anyone who sees it will die. It's been theorized that the Mapinguari is a giant ground sloth.
Click the link to hear what I think a giant ground sloth mating call would sound like. (To save: Right click and choose "Save target as..." or "Save link target as..." You may also edit the sound. You have my permission.)