The value of the North American beaver (Castor canadensis) lies as much in his teeth and his temperament as in his fur. In April, his working season starts. He fells trees with his sharp incisors, dams up a stream with logs, mud, leaves, boughs, increases its depth and area, builds along the water's edge a lodge for his family. He works mostly at night. In November, when the frost sets in, he stops work, seals his home with mud (which soon freezes solid), takes a long rest.
Beaver dams are useful to man. They catch fine silt that otherwise would wash down...
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