90 GEOGRAPHICAL DISTRIBUTION 



the northern and the southern divisions of the Temperate Region, 

 but also to the Tropics, are as follows : 



Ardea cinerea. 

 Podiceps minor. 

 Fulica atra. 

 Gallinula chloropus. 

 Alcedo ispida. 

 Himantopus avocetta. 

 Upupa epops. 

 Platalea leucorodia. 



The range of the following five species does not extend quite 

 so far north, being only tropic and subtropic : 



Himantopus candidus. 

 Ardea purpurea. 

 Ardea garzetta. 

 Ardea alba. 

 Sterna hybrida. 



WEST PAL^EARCTIC SPECIES. 



There are no fewer than 134 species of British Birds whose 

 breeding range is confined to the western half of the Palsearctic 

 Region. Of these, ten do not extend eastwards beyond longitude 

 10, two reach 25, nineteen are found as far as 50, and four as 

 far as 60, forty-five breed as far east as 70, the range of twenty- 

 nine extends to 85, and that of twenty-five to 110, beyond which 

 the East Palaearctic Region is entered. 



Species whose, Breeding Range extends from the Atlantic to 

 Longitude 110. 



There are twenty-five species of British Birds whose breeding 

 range extends from the British Islands eastwards across Europe 

 and West Siberia, but does not extend (so far as is known) into 

 East Siberia. The West Palaearctic Region extends to the basin 

 of the Yenesei about longitude 110. Nature has fixed this 

 boundary very exactly. The. Himalayas form a barrier which 



