You saved the baby bird. Sure, you put a rock on it to keep it warm. You sat on it to keep it warm. You got attacked by a large bird and kept your cool for the best interest of the baby bird. It could not have been easy to be so passive and generous when such hostile forces approach you, but you managed yourself well.
The baby bird is gone and out of your life. That might be a bit sad, but it might also be a bit necessary. You, as a bear, are not very equipped to keep a baby bird nurtured long enough to become a large bird. That is okay, though. You did well considering the tools nature gave you.
Hello, I am a bear 