Hi I am hoping somebody can help. I have had Pepe (male cockatiel) now for about 7 years and he is very closely bonded to me. My girlfriend wanted her own pet and got herself a cockatiel of her own yesterday. Yesterday everything was fine and Pepe did not seem that interested in Lilly the other cockatiel. However, today he has been fine and gentle with Lilly but very aggressive towards me, swooping and biting me. This is very out of character and has worried me a bit. Is there anything I can do to stop this?