Perhaps it's because zoos used to name areas in their zoos more often based on animal types but now are going more towards regional?
So previously zoos would put all the monkeys, or bears, etc., in an area. But now zoos are trying to group animals together as much as possible based on region.
So previously zoos would put all the monkeys, or bears, etc., in an area. But now zoos are trying to group animals together as much as possible based on region.