This extinct mammal, related to the living sewellel, is the only known horned rodent and the smallest horned mammal. From Wordnik.com. [Science Press Releases] Reference
1 The sewellel (Haplodon rufus) belongs to a family which seems to be intermediate between those of the squirrel and the beaver. From Wordnik.com. [Original journals of the Lewis and Clark Expedition, 1804-1806] Reference
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