Do you need more room for your animals ...

[NewtyFruity]

In any area where you have 9 large habitats with 3 max animal limit (27 animals total) , must be 3 x 3, you can replace all of them with 16 small habitats (32 animals total), 4 x 4.
You'll gain space for 5 more animals.
You won't collect as many coins but they're in abundance when you get to a higher level.