Do they bite!...

These bites are usually very small and painless (for tamed cockatiels only). When they are moody or annoyed, they bite you but they dont want to hurt you, so its really not hard.

Cons: Either way its still a bite. Sometimes they do hurt you. When they get angry or annoyed, they can bite pretty hard(If they are untamed), and you have to watch them to make sure they don't accidentally peck at your eyes. there are people who had bad experiences too.