Sloth will not work for food

German scientists are having trouble getting their sloth to work:

Scientists in the eastern German city of Jena said Wednesday they have finally given up after three years of failed attempts to entice a sloth into budging as part of an experiment in animal movement.

The sloth, named Mats, was remanded to a zoo after consistently refusing to climb up and then back down a pole, as part of an experiment conducted by scientists at the University of Jena's Institute of Systematic Zoology and Evolutionary Biology.

Neither pounds of cucumbers nor plates of homemade spaghetti were appetizing enough to make Mats move.

"Mats obviously wanted absolutely nothing to do with furthering science," said Axel Burchardt, a university spokesman. (Emphasis mine.)

If I didn't know better I would say that sloth was a graduate student in disguise.