I got 4 parakeets i starting training one of them about 2-3 day ago he steps on my finger inside the cage and is becoming friendlier to me day by day. But i have a problem even thought he steps on my finger and everything he bites me its hard and its hurts. but i think he is either playing with me or he is biting my fingers because he thinks of them like a chew toy. how can i stop this habit.