There is a gap where the divider fits into-the gap is large enough for small finches to get through. You have to use the divider or put something in front of this gap to keep small birds in. Also, you have to use the grill at the bottom of the cage. If you don't there is a large gap where the floor pan and grill inserts. A disappointment for me, since I wanted to use the cage for my finches. I recommend to use it for larger birds, like for cockatiel sized birds but still have to keep the bottom grill in or patch up the gap at the bottom.