Some traps attract the bugs but don't kill them, agitating them to spray wafts of their stinky scent, he says.

WSJ: Out of Odor: Offensive-Smelling Bugs Put U.S. Farmers on the Defensive

"Keep in mind, they are coming off 14-hour trips and if you don't let them rest - you'll kill them, " he said.

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Unlike deer hunters, who don't always mount their kills, those who kill bears tend to preserve them.

WSJ: After Long Hibernation, Taxidermists Make a Killing During Bear Season