Some Cockatiel Questions?

My female cockatiel have never bit me. She just push or nip me. I once bled from my male cockatiel's bite. It was when I caught him to clip his wings. He is aggresive, strong, and untame compared to my female. He still hiss and open his beak to scare me, but he haven't bit me since then. They don't bite if it is not neccecary! And I wouldn't recommend you to clip their wings. Everything could go wrong. Not only will you risk to injure your bird, but your bird will HATE you! I have experienced it with 2 birds and I regret it. You need atleast 2 people and a sharp scizzor..But don't do it...Finding informations about cockatiels is very easy. Just google it and websides will pop up!