214 AUSTRALIAN BIRD MAPS 



NATURAL AREAS OF WESTERN 

 AUSTRALIA 



Centuries have felt the influence of birds living 

 in definite areas, all the year round, or migrating to 

 and from them annually. 



These areas having different types of vegeta- 

 tion have many forms of birds. So marked are they 

 that millions of finches will feed on grass seed in 

 one area, thousands of lorikeets on honey-bearing 

 flowers in another, and innumerable scrub birds in 

 forests of different types having different kinds of 

 insects. 



Climatic effect, as in map 96, B b 1 , will produce 

 colour tone, and if the particular birds are internal 

 migratores they will annually return to the area of 

 their birth. 



Birds mostly come in from the direction of New 

 Guinea or come south from the Northern Territory, 

 map 96 K. The lines of immigration indicated in 

 H and F have been previously mentioned. 



The great junction areas A A, B B, D D, are the 

 boundaries of the mass of species in Western Aus- 

 tralia. 



At Nullabor Plain, D D, we have the meeting 

 ground* of birds from South Australia and birds 

 from Western Australia, both sections keeping 

 apart : the latest discovery among parrots being the 



^Address to the R.A.O.U. Perth Congress, 1920, R. Hall. 



