So I volunteer at the La Brea Tar Pits and ocassionally have some free time with a sketchbook. This is Harlan's Ground Sloth, Paramylodon harlani. This drawing is modeled on the skeleton that greets guests if they go left at the entrance, pictured below.
Paleo Art: Harlan's Giant Ground Sloth [P. harlani]
by Tailon