Carl Linnaeus, The Lapland Journey, translated by Peter Graves (Edinburgh: Lockharton Press, 1995), p. 156.
Jokkmokk [2], 23/07/1732, ¶842:
The ptarmigan, “cheruna” in Lappish, lives on dwarf birch and creeps under the snow at night like capercaillie. Consequently, great quantities of its droppings are to be found on the ground in springtime, which is why it is easily caught by foxes.