I thought their sloth was a Linnaeus's Two-Toed Sloth (Choloepus didactyllus) not a Hoffmann's Two-Toed Sloth (Choloepus hoffmanni). Is this just a mistake by you, or is it just that the zoo hasn't updated their website?
Do you have any proof to back this up. The zoo's website and the sign in the Rainforest Building says Linnaeus's. I would love if it was though since it would be a new species for me. Next time you visit the zoo, ask one of the keepers since you are much more likely to go before me.