Chinchilla
2 of the 7 encyclopedias on this shelf carry an entry for Chinchilla. Both are reproduced below, so you can see where they agree and where they differ.
Collier's New Encyclopedia (1921)
a genus of South American herbivorous rodents very closely allied to the rabbit, which they resemble in the general shape of the body, in the limbs being longer behind than before, in the conformation of the rootless molars, and by the nature of the fur, CHINCHILLA which is more woolly than silky; but differing from the rabbit in the number of their incisors and molars, in a greater length of tail, and also in having broader and more rounded ears. C. lanigera, a species about 15 inches long, is covered with a beautiful pearly-gray fur, which is highly esteemed as stuff for muffs, pelisses, linings, etc. The chinchilla lives gregariously in the mountains of most parts of South America, and makes numerous and very deep burrows. It is of a gentle nature, very sportive, losing none of its gaiety in captivity, and very cleanly.
Aiton's Encyclopedia (1910)
a small rodent reminding one of the field mouse, the chipmunk, and the coney. It is about ten inches in length, with half as much to be added for its tail. It lives in colonies in the Andean region. It is clothed with beautiful, pearly gray fur, greatly in demand for muffs, linings, ladies' capes, and the like. The chinchilla is trapped for its fur by the Indians who sell to the traders in the towns. The high prices prevailing have led to a marked diminution in the numbers of this inoffensive animal. In 1905 1,461,200 chinchilla skins were exported at $29.90 per dozen; in 1908 the number fell to 38,000 skins, though the price had risen to an average of $43.85 per dozen.