i'm assuming jwer that you mean, like my platypus question, that they are the most expensive animal to keep and not expensive in terms of worth?
okay i'm not gonna cheat and google. the names are spanish sounding , so i'm going to take an educated assumption that its likely a south american animal.
hmmmm expensive to keep.....never heard of blijdorp zoo (unless it is THE rotterdam zoo) so i could be small. they might not be expensive compared to other zoos. could be a specialty feed issue - dunno are they... um.....sloths?