When you see the early bird out there on the lawn, head cocked to one side as he catches the worm, don't think he's listening for it. He's looking for it. With eyes at the sides instead of facing ahead as do ours, he is able to see in the worm's hole by cocking his head. Besides, worms make very little noise, something like smacking your lips together. The average robin requires about seventy worms a day, so he has to get up early.