I am reprinting part of this article of Darren Naish's because people don't realise what a diversity of sloths there once were and why we are facing a quandry when we are talking about the possibility of surviving groundsloths. We do not only have survivals of one kind of generic groundsloth that is reported everywhere today, but instead we have a number of reports of highly varied groundsloths with different anatomies described in different areas. And I thought I sould mention that my home manuscript report dealing with the topic has a drawing basically like a simplified version of Darrens drawing for "Sloth Diversity" shown directly below.-DD
By Darren Naish August 30, 2012 About Darren Naish Darren Naish is a science writer, technical editor and palaeozoologist (affiliated with the University of Southampton, UK). He mostly works on Cretaceous dinosaurs and pterosaurs but has an avid interest in all things tetrapod. He has been blogging at Tetrapod Zoology since 2006. Darren Naish is a vertebrate palaeontologist, currently based at the University of Southampton, UK. From 1997 to 2006 I worked on the predatory dinosaurs of the Lower Cretaceous of southern England, focusing for my PhD on the tyrannosauroid Eotyrannus. My published technical work is mostly on theropod and sauropod dinosaurs, but I've also worked on pterosaurs, marine reptiles and marine mammals (see list of references below). Since completing my PhD I’ve worked in the media and as a technical editor and freelance author (see list of books below). I like dinosaurs very much, but they’re far from the only animals that I find interesting: I'm fascinated by all tetrapods and have some practical and research experience with Mesozoic marine reptiles, marine mammals, flightless birds and pterosaurs. I spend as much time in the field as possible, looking at real live tetrapods.
A typical fossil sloth can be imagined as a rather bear-shaped, shaggy-furred mammal with particularly powerful forelimbs, a barrel-shaped ribcage, a stout tail, prominent curved hand and foot claws and a markedly broad, robust pelvis.