266 STUDIES IN BIRD-MIGRATION 



birds which are known to have occurred at Eilean Mor 

 during the past twelve years (igcxj-igii) ; including 

 some of the dates upon which they have appeared. 



Rook, Corvus frugilegus. — The nature of the visits 

 of this bird is somewhat uncertain. It appears annually 

 in small numbers during March (14th earliest) and 

 April (loth latest), and some years in May (as late 

 as the 24th). Some of these visits may possibly relate 

 to passage movements. In autumn it has only appeared 

 on two occasions, on 24th and 26th October 1907. 



Jackdaw, Corvus monedula. — ^There are two records 

 only for the visits of this species — namely, of single 

 birds on 22nd February 1901, and 7th November 1905. 



Starling, Sturnus vulgaris. — A regular visitor 

 during the periods of the spring and autumn passages 

 to and from the north, and in winter during severe 

 weather. 



The spring movements date from 28th February to 

 17th April, March being the main month for their 

 performance. 



The return passage southwards is sometimes recorded 

 for late September (27th earliest), and is in progress 

 until mid- November. In October the bird often occurs 

 in great numbers along with other migrants. 



Chaffinch, Fringilla coslebs. — Appears annually, 

 sometimes in considerable numbers, in autumn ; but is 

 neither frequent nor numerous in spring. It is also an 

 occasional visitor in winter. 



The autumn observations date from 4th September 

 to mid-November, but it does not become numerous 

 until mid-October. 



The earliest record in spring is for 6th March, and 

 the latest for 17th May, 



