517 
1921 .] Bird-Migration by the Marking Method. 
Mortensen (11) has found this species highly migratory, 
Danish-bred birds reaching southern England, Brittany, and 
southern Spain. 
SHELD-DTJCK (Tadorna tadorna Linn.). 
Of a brood of ducklings marked in Hampshire on 
16 July, 1912, the following reappeared :— 
Case 447 : 10 Feb. 1913, Saltash, Cornwall. 
Case 448 : ca. 12 Aug. 1913, Biisum, Schleswig-Holstein, 
Germany. 
Case 906 : 18 Aug. 1917, Mouth of the Weser, Germany. 
The eastward wandering in two cases is curious and 
suggests that of the two Mallards previously referred to in 
Section VI. : the explanation already put forward might 
also apply here, although in the absence of other records one 
cannot be so certain that these are exceptional instances. 
TEAL (Querquedula crecca Linn.). 
One (Case 446) marked as a duckling in Inverness-shire 
on 29 May, 1912, was shot in County Waterford, Ireland, on 
5 February, 1914. The only other record is of no interest. 
Teal marked in Denmark by Mortensen (10), having been 
caught in decoys on autumn passage, have been recovered in 
Holland, England, Ireland, and France, and in southern 
Spain and northern Italy. 
WIGEON (Mareca penelope Linn.). 
Of a brood of five ducklings marked in the east of Suther¬ 
land, Scotland, on 19 June, 1909, the following were 
recorded :— 
Case 4 : 3 Sept. 1909, Ulrum, Groningen, Holland. 
Case 118 : ca. 2 Jan. 1911, River Trent, Nottinghamshire. 
The species is chiefly known in the British Isles as a 
winter visitor or bird of passage, and this slight evidence of 
movement on the part of native birds is of some interest. 
WOOD-PIGEON (Columha palumbus Linn.). 
Twelve birds marked as nestlings in various parts of 
Scotland were subsequently recorded, ten of them from 
