114 STUDIES IN BIRD-MIGRATION 



ings, Lapland Buntings, Starlings, Rooks, Skylarks, 

 Shore Larks, Short-eared Owls, "Grey Geese," Brent 

 Geese, Whooper and Bewick's Swans, Mallards, Gad- 

 walls, Wigeons, Golden-eyes, Scaup, Long-tailed Ducks, 

 Red-breasted Mergansers, Golden Plovers, Lapwings, 

 Woodcocks, Dunlins, Curlews, Little Auks, and Red- 

 throated Divers. 



The emigratory movements from the south-east 

 coast of England in an easterly direction towards the 

 coasts of Holland, Belgium, and north-eastern France, 

 which commenced during February, become more pro- 

 nounced, and the travellers include Black Redstarts, 

 Tree- Sparrows, Chaffinches, Starlings, Hooded Crows, 

 Rooks, Jackdaws, and Skylarks. Numbers of some of 

 these species, the Grey Crows in particular, move south- 

 wards along the shores of Yorkshire and Lincolnshire 

 in order to reach the scene of embarkation on the coasts 

 of Norfolk, Suffolk, and Essex. 



April. — This is the first month of the year in which 

 the increase of temperature usually makes itself pro- 

 nouncedly felt over both our insular and the continental 

 areas. In the British Isles the isotherms then make 

 the nearest approach to straight lines, though with 

 a slant from W.N.W. to E.S.E. It is a month of 

 much sunshine, the amount rising to 13 per cent, 

 of the annual. The winter type of distribution of 

 temperature, in which the inland values are lower than 

 those on the coast, disappears, and the summer type, 

 with its high inland values and low coast values, takes 

 its place, and prevails until October. 



Throughout the month the movements of migrants 

 are of a pronounced nature. 



