How do you make your egg hatch in fly like a bird 3

Everyone said stuff about this except it was "when it hatches there is no chick you get extra life". Now that has changed! When it hatches a chick comes out and you keep feeding it when it is hungry. To feed press space if there is a bird icon on the mini map. If you feed it enough it will grow up. Return to your nest and the adult chick will fly away. THEN you get an extra life. Sometimes someone else's chick grows up and you still get a life... it's weird!