December 1956 – vol. 49, issue 12–488 T H E migration of birds--the routes they take, the means by which they orient themselves and reach their destination--is at present receiving' considerable attention. The House Sparrow (Passer domesticus) is generally considered to be a sedentary bird and thus it is not a species that gets much mention in papers dealing with migration. However, since migration is such a widespread phenomenon in th... This article is only available to registered users.To read more, please log in or purchase a subscription.