ALAN SIRULNIKOFF / SCIENCE PHOTO LIBRARY ALAN SIRULNIKOFF / SCIENCE PHOTO LIBRARY
Beaver damage. Tree trunk gnawed by a North American beaver (Castor canadensis). Beavers are herbivorous rodents which feed on wood during winter. The beaver's incisors grow constantly during it's life, making it necessary for it to occasionally gnaw on trees without felling and using them. Photographed in British Columbia, Canada.
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