Hi - question on bluebirds. The bluebird on the left is younger- the parents are still feeding it. The bluebird on the right is an older sibling - hatched in the spring. At first I though the older bird was trying to feed the younger one but then it started attacking it. I finally hit the window to stop it from pecking the younger, smaller bird. Do you know why it did this? I keep more than enough worms out there all the time for the bluebirds. I believe there are 7 - the parents, 3 juveniles hatched in the spring, and two more juveniles hatched more recently which the parents still feed.