Elementary biology; an introduction to Elementary biology; an introduction to the science of life elementarybiolog00grue Year: 1924 Red-headed woodpecker (Melanerpes crythroceplialiis) ;,..' - 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 pr
Elementary biology; an introduction to Elementary biology; an introduction to the science of life elementarybiolog00grue Year: 1924 Red-headed woodpecker (Melanerpes crythroceplialiis) ;,..' - 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
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