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The thermal properties of reindeer fur are legendary: it has a thick felty layer of underwool and long thick guard hairs that appear to be hollow, but on inspection under a microscope each hair turns out to have a core of vacuolated, keratinised cells.

Its hair is more like that of a goat than a sheep, of a brownish gray colour, and with a dense coat of underwool.

The hair is very long, very black and bright with no underwool, and the white pelt of the base of the hair, by reason of the great contrast of colour, is very noticeable.

Generally they have coarse rigid hair and none possess any underwool.

A very prolific rodent of the amphibious class obtained from Canada and the United States, similar in habit to the English vole, with a fairly thick and even brown underwool and rather strong top dark hair of medium density.