Urson

The urson (Hystrix dorsata)^([sic]) inhabits the United States and Canada, and is the only species of porcupine, properly so called, which appears to have the power of climbing trees.

The urson might be called the spiny beaver, it being of the same size, the same country, and the same form of body;[…]. In the young ursons, the prickles are proportionably larger, more apparent, and the hair shorter and scarcer than in the adults.