Carl Linnaeus, The Lapland Journey, translated by Peter Graves (Edinburgh: Lockharton Press, 1995), p. 87.
Västerbotten [2], 08/06/1732, ¶405:
They set traps for capercaillie on the small side roads all over Lappmark in the autumn. I had noticed them but had not been able to understand properly the workings of these contraptions until now, when there was a farmer on my route who had one. It was made of 6 logs split at both ends and fixed together with a crosspiece; between them there was a stake fixed into the ground. A prop, held up by a willow wand that runs down into a loop, is then placed under the front end. A hook is attached to the rod and the point of the hook rests on a long stick. When the capercaillie comes and settles under it or touches the stick, it knocks it away, the hook disengages and the prop springs out. Thus the weight, which had been supported at an angle as a trap, falls and suffocates the bird.