Passeres 



95 



young have that part feathered, and are best dis- 

 tinguished from Crows by the dark or livid, as opposed 

 to pale flesh-coloured, inside of the mouth. These 



Rook 



birds are constant migrants to and from the Continent. 

 The flight is powerful, if slightly laboured. 



Family ALAUDID^S, or Larks 



The Skylark (Alauda arvensis) is too well known to 

 need any description, but it must be noted that its 

 erectile crest has sometimes caused it to be taken by 



