I forgot to latch the door last night to the cage. My husband had covered them, but at 3am, I heard bursts of growling coming from the living area. It took a while to even realize it was growling. I jumped out of bed and ran out, to find Manzi proudly on top of the cage, slowly grabbing the cover and sliding it off, a few inches at a time. Since it was so dark, the movement was scaring Maui, and every time a bit slide, she growled!