276 STUDIES IN BIRD-MIGRATION 



2 1 St May to 28th June. On 15th June 1907, however, 

 twenty appeared — a most unusual occurrence. 



For autumn there are records of single birds at dates 

 ranging from i6th to 28th September. 



Cuckoo, Cuculus canorus. — Has been known to visit 

 Eilean Mor twice in June. On these occasions, single 

 birds were killed at the lantern on the 9 th of the month 

 in 1906, and on the 15 th in 1907. 



Short-eared Owl, Asio accipitrinus. — Single birds 

 have been recorded on five occasions during spring and 

 autumn — namely, on 5th and 8th May, 5th June, 

 29th September, and 3rd November. 



Snowy Owl, Nyctea nyctea. — Single birds have 

 been recorded on two occasions — namely, on 6th and 

 7 th May 1906, and 12 th October 1903. 



Peregrine Falcon, Falco peregrinus. — In addition 

 to the native pair of birds, which leave in September, 

 the islands are occasionally visited by falcons of this 

 species in the late autumn and winter. 



Merlin, Falco cssalon. — A regular visitor during the 

 spring and autumn passage movements, probably 

 accompanying its migratory prey on their journeys. 

 It is also an occasional winter visitor. 



Its spring appearances are dated from 2nd March, 

 during April and May, and as late as 7th June. 



In autumn it has been observed between 2nd 

 September and i6th November. One was captured at 

 the lantern on 19th September 1900, and sent; and 

 another visited the light and was seen taking Wheatears 

 flying in the rays on 2nd September 1905. On 30th 

 September 1902, a Merlin chased a Pipit into the engine 

 house and was secured. 



Greenland Falcon, Falco candicans. — Has several 



