PLATE X. 



A and B : Pigeons alighting. Though in B the feet are 

 still clear of the window-ledge, I think the bird is giving 

 his wings the final stretch that with many species is pre- 

 liminary to the folding of them. C : Pigeon checking speed 

 before alighting. (See Chap. VI.) 



To face p. 64. J 



