i6o 



INSECTS 



on a hairy animal or thin plumage on a chicken or 

 other bird, is very apt to be due to biting lice. In breed- 

 ing habits they resemble the Pediculids very nearly; 

 the eggs are fastened to the hair or feathers and there 

 is little apparent change in outward appearance from 

 the nymph just out of the egg, to the adult ready to 

 reproduce. None of these species are found on man; 

 but nearly all farm animals and all the domesticated 

 birds are likely to become infested, each with its own 



A ''fl ~ B 



FIG. 67. a, chicken louse; b, turkey louse. 



peculiar species. It is rare that one species of parasite 

 is found on two species of animals not very closely 

 allied; but it is not uncommon for a single species of 

 animal to harbor two or more kinds of parasites. 



Birds are as fond of a powder bath as are the four- 

 footed animals, and poultry keepers have long recog- 

 nized the importance of the dust box in keeping their 

 charges in good condition. It should always be the 

 finest of dust available and there should always be 

 plenty of it in a box of generous size so that even the 

 largest bird can cover itself thoroughly without scat- 

 tering the material beyond the edge of the container. 



