Can a robin hear worms in the Ground?
A bird, of course, has no outer ears on his streamlined head. The job of hearing is done by the inner ears which are very complex organs buried within the bones of the skull. Our hearing also is done by inner ears. Though a bird has no outer ears as we do, he has a very sharp sense of hearing. The robin is usually the last of the migrating birds to leave his northern nesting grounds and the first to return. The first robin, we say, is a reminder that spring is just around the corner. In California and some of the Southern states, Mr. Robin and his family are year¬round residents. They are taken for granted and may be less noticeable. He attracts more attention when he returns to the central and northern states because he has been missed during the winter months. People run to the window to watch the first robin hopping over the lawn. From time to time he stops and cocks his head as though he were listening to some activity in the ground. If we watch long enough, we are sure to see him