18 AUSTRALIAN BIRD MAPS 



MAP 5 



Some features of Australian Birds. 



a. Tasmanian forms are inclined to be larger than 



those of the same species on the mainland. 



b. Size decreases from south to north in same species, 



e.g. Red-browed Finch. 



c. Colour increases in intensity from south to north, 



e.g. Yellow Robin. 



c 1 Eopsaltria australis. 

 c 2 E. chrysorrhous. 

 c 3 E. magnirostris. 



d. Mountain colours are darker than those of the 



same species on the drier interior, e.g. Rufous 

 breasted Whistler (Pachycephala rufiventris). 



e. Sunken portion of a continent severing the same 



types of birds between f and f, e.g. Bristle bird 



(Sphenura). 

 g. A desert 8 inch rainfall as a barrier to certain 



birds. Birds coloured in keeping with the soil, 



e.g. Mirafra h< h 2 h*. 

 j. A present day connecting link, Nullabor Plain. 



