Our male cockatiel is about 9 yrs. old and he loves to explore in dark places. I took a 8 x 8 cardboard box and cut a hole in it and placed it on the floor. When I take him out to play and run around he has become so possessive over this box. He attacks you and screams if you come near it. He loves to go into and just pecks away at the cardboard and will come out in his own good time but refuses to allow anyone around it. He is an only bird, there is no mate. Are we confusing him into thinking this is a nest?
