ANIMAL PARASITES 



'75 



ing of the pigeon's parasites is the one shown in 

 Fig. 115, which is supposed to confer a benefit 



upon the bird by thinning its body-plumage as 

 the weather grows hot. 



Similar slender - bodied and possibly useful 

 parasites are found on many birds, including the 

 domestic fowl, coot, water-hen, house-martin, &c., 



