The fishing behaviour of 17 hand-raised Common Guillemots(Uria aalge), 3–12 weeks old, was investigated experimentally. The young birds were capable of succesfully catching fish, although at first only slowly moving ones, without help from the parents as early as 25 days of age. It was demonstrated that the faster a fish moved through the water the more often it was caught by the posterior half. The fish were always swallowed head first, however. The biological significance of these results is discussed.