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The cups to have the bait in I stole from work.

I raised the traps up into the canopy (5-6m height) at the summit of a nice little hill which has recently became a nature reserve, here at 65 degrees north in Sweden, at about 250 m above sea level. The hill is covered with old-growth boreal forest with large, standing, rotting aspen, birch and spruce.

Here you can see the trap together with the catch that I got after about a month (each bottle is the catch from one trap - I had a total of six traps active at this one site since I did not expect them to be so efficient!).