The Memphis Zoo has a sloth, and it's one of the most popular animals! They never have a problem getting sponsors for the sloth. They are fun to watch and always seem to be in a good mood.
The keeper at the Memphis Zoo says their two-toed sloth can be a little moody, but the three-toed just takes life as it comes, and doesn't get upset by much of anything.
Sort of an example of why moving slow and not getting in a hurry seems to reduce stress.