Inside a Robin's Nest Day 11 The babies fill up the nest now! They are big enough to keep each other warm, so mom sleeps on a nearby branch. Their eyes are open wide. Why are eyes so important to robins? Think about this as you watch them outdoors. Their beaks are longer, too. When mom or dad comes back with food, the beaks will also open wide. These babies eat all day long! Did you see the small hole near the beak? It works like our nose, but birds can't smell much! Back