I use to have 2 birds, they were out of their cage 25/7 even with cubby being out and about all day long. Ever time they flew off the cage Cubby ran and hid under the bed, he was afraid of them. He loved to watch them but he never wanted to hurt them. If i wasn't home the birds would stay ontop of the cage, and cubby would lay on the couch asleep. He has killed 1 fly so far. He also killed a chicken as well ( he stole a peice of chicken off of hubby's plate and he Cubby thought he killed it).