Growth of young Guillemots Uria aalge after leaving the colony
Harris MP, Webb A & Tasker ML (1991) Seabird 13:40-44
Young Guillemots were weighed at a colony and at sea in two years. Growth at
sea was as rapid as growth at the colony. By late August, chicks and adults at
sea were both much heavier than adults when they were at the colony. The
chances of a chick surviving to return to the colony in a subsequent year is
likely to be linked with some aspect of its at-sea development rather than to its
weight when it leaves the colony.