Also... does anyone have any trick to make the monkeys stay in the islands but the rest of the animals in the ground?
The islands will have it be their own separate habitat. I’d recommend starting the habitat with the gate to the left of the little suspension bridge. Place null barriers around the perimeter of the top of both of the islands, including the crossing points between them. Then use rocks and climbable items for them to cross between the islands and prevent them from getting down to the ground level since that would technically be escaping. That should keep your monkeys up above and everything else below. I hope that makes sense.