156 THE MIGRATIONS OF BIRDS 



forms of wagtail, the red-backed shrike, the willow 

 wren, the spotted flycatcher, the swallow, the 

 Egyptian kite, three marsh harriers, the white 

 stork, five plovers, and an assortment of other shore- 

 birds. In southern Africa Sclater finds 21 native 

 species regularly migrant toward the north at the 

 close of summer, which return in spring to breed. 

 They are supposed to winter in central Africa. 

 Curiously enough, of the entire number of these 

 migrants no less than nine are cuckoos. These are 

 accompanied by three native forms of swallows, a 

 swift, a roller, a wryneck, a falcon, Abdim's stork, 

 two coursers {Cursorius temminckii and Rhinoptilus 

 chalcopterus)y and a wattled plover {Afribyx sene- 

 gallus lateralis). 



Local migration is, however, more extensive in 

 southern Africa than the list just enumerated would 

 indicate, since there are about fifty additional forms 

 a part of whose individuals remain in winter when 

 others travel to the north. Movements among 

 these are dependent in part upon rains or other 

 conditions. Some, as the wattled starling and 

 Nordmann's pratincole, wander, when not nesting, 

 with the appearance and disappearance of the hordes 

 of locusts for which these regions are noted. The 

 white stork, a migrant from Europe, joins them in 

 their travels during the season that it is present. 

 Andersson, in studies of the birds of Damaraland, 



