January 1945 – vol. 38, issue 8–152 THE arrival and departure of migrants are usually recorded by the dates upon which the first and last birds are seen. The arrival date of the first bird of any migrant species is usually fairly close to the arrival of the main bulk of that species : even so a particularly early bird may give a distorted view of the actual course of the migration. In the autumn records of this kind are far more uns... This article is only available to registered users.To read more, please log in or purchase a subscription.