Text-fiffure 10. 



B. 



C. D. 



Diagrams to illustrate variation in the same family. 

 Corvus corone: down plentifully distributed, but not very lonr 



gTeyisli-wliite in colour ; about 3 days old. 



B, Corvus mo7iedul a: down-tracts somewhat abbreviated, absent from 



head; greyish-white in colour; large wax-like llanges to the 

 gape; breeds in semi-obscurity; about 4 days old. 



C. Pica pica: down abseut; breeds in a domed nest, and is therefore 



protected from above ; about 3 days old. 

 I). Corvus fnf(/ile(/us: down absent from head; smoky grey; gnpe- 

 fianges incouspicuous ; one day old. 



3m2 



