428 



ELEMENTARY BIOLOGY 



often destroys the eggs and sometimes even the young of 

 birds, and does nothing to compensate for this damage. 

 These animals should therefore be killed, to give the birds a 



Cedar waxwing (A mfelis cedroruni) Yellow-bellied sapsucker {Sphyrapicus varius) 



Red-headed woodpecker (Melanerpes 

 crythroceplialiis) 



---.S>,..' - 

 Great blue heron, or crane 



(Ardea herodias) 



Fig. 226. Some suspicious tramps 



During part of their migration the cedar wax^ving- destroys fruit and disperses weed 



seeds; the yellow-bellied sapsucker injures standing trees; the red-headed woodpecker 



destroys cultivated fruit ; the blue heron eats fish and frogs. But on the whole they pay 



for all they consume, and a little more, and are therefore protected by law 



better chance. The weasel, the skunk, the fox, the raccoon, 

 and other mammals sometimes kill birds or eat their eggs ; 

 but as they do not feed exclusively or largely upon birds, they 

 are not to be considered serious enemies. 



J 



