408 Dr. A. L. Thomson : l^esult.s of a Slinhi of [Ibis, 



TABLE XIV. 



Seasonal Analysis of Eeappeaeances of Herring-Gulls 

 caught on the shore at night, marked and released, near 

 Aberdeen, September and October 1910. 



(* Two records refer to the same bird (Case 205).) 



Of the above, 3 were recovered in tiie first year after 

 niarking, 2 in the second, 2 in the ihird, and 1 in the fourth. 



Although the number of records is not great it is sufKcient 

 to show that the Herring-Gulls found on the Scottish coast 

 in the late autumn are of a category different from the native 

 birds, thus bearing out the conclusion that most of the latter 

 move southwards in winter. The differences include winter 

 records from the area of marking and summer records from 

 farther north and from the Continent. Case 205 is of 

 sjjecial interest in showing that the bird returned to the same 

 winter area after having been to the Orkney Islands in an 

 intervening summer. 



Taking both sets of data together it seems fair to conclude 

 that our native birds tend to wander ."southwards in winter, 

 mainly within the British area, and that Continental birds 

 appear as winter visitors. 



In addition to the two sets of records dealt with above, 

 Herring-Grulls marked as chicks in 1910 in the Lewis, Outer 

 Hebrides (Case 112), and in Berwickshire ((^ase 232), were 

 recorded from the same localities on 5.12.10 and 3.b.ll 

 respectively. 



