cockatiel behaviour

Hello, my baby Fu (2 years 3 months old) has been a bit different these days. He is a bit more aggressive and does not want to come out of the cage although he used to love coming out and sitting with me. Since last 3 days, he bites my finger off when I try to take him out of the cage. Two days...

Hi all, I'm new to cockatiels! I rescued these birds from cages in someones garden in the snow. iv had them since sunday (5 days). We're all getting used to each other. I wasn't expecting to have four cockatiels so we're getting to know each other and I'm just judging what they need atm so bear...