The scientific family name for beavers, including all living and extinct beaver species.
From Latin castor (beaver) + -idae (the scientific suffix for animal families), following Linnaean taxonomy naming conventions.
Beavers are so significant to ecosystems that they're called 'keystone species'—meaning they engineer their environment so dramatically that removing them cascades through the entire ecosystem, which is why reintroducing beavers to rivers actually restores entire landscapes.
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