Thats not even the funniest part if you reed the second point on the right you can just about see that it says "inhabit the near tropical forests of central Brazil". THEY DIDN'T EVEN READ THEIR OWN SIGNS!! This is so funny.
Well, the most charitable interpretation of this may be that the person who prepared this sign was misguided by some teacher that Brazil is a country belonging to the continent of Africa and also believes that a marmoset is a rodent.
Ah, the majestic African marmoset. Rarely kept in captivity by many zoos,must have been a treat to see. And that exhibit, must've been really expensive to Construct, probably like, 30$ from the local roadside pet store. A true advancement in the zoo world (obvious sarcasm is obvious) .