TiTK imrrisii isr.ES: autumn ho 



Sandpiper, •Sa^derlin<^^ Green Sandpiper, Wood Sand- 

 piper, Dusky Redshank, *Bar-tailed Godwit, Black- 

 tailed Godvvit, Black Tern, Little Gull, Sabine's Gull, 

 Pomatorhine Skua, Great Northern Diver, and Red- 

 necked Grebe. Some of these also remain the winter, 

 among them the Barnacle and Brent Geese, Grey 

 Plover, Turnstone, Jack Snipe, *Knot, Purple Sand- 

 piper, Sanderling, Bar-tailed Godwit, Redshank, Great 

 Northern Diver, and Red-necked Grebe. Those marked 

 with an asterisk occur regularly during August, while 

 the rest have only occasionally been recorded for the 

 month. 



September. — This is an important month for the 

 departure of a great variety of migratory birds from 

 their summer homes in far northern and north-temperate 

 regions. The temperature has then fallen in the 

 northern hemisphere, and values below freezing point 

 are to be found over wide areas of the arctic regions 



Departure of Suvwier Visitors. — In our islands, 

 September witnesses the height, and almost the close, 

 of the emigrations for winter quarters of all the numerous 

 species which have spent the summer with us. Our 

 native Swifts and adult Cuckoos are the exceptions, 

 for they have usually departed by the end of August. 

 It is true, as has already been indicated, that other birds 

 of nearly all the species occur later, but these are chiefly 

 on passage from more northern countries, where the 

 nesting season is much later than in our own. 



There are often considerable movements of these 



emigrating British birds southwards, and finally across 



the Channel, synchronous with the prevalence of 



ungenial weather, which acts as a reminder to those 



I. K 2 



