As advanced as the bear populace seems in Naughty Bear, some things never change. Raw fish and honey are still mainstays of their diet, for example. As you can see in the trailer above, they also remain susceptible to the bear trap. Apparently, when it comes to objects that look like gigantic metal shark mouths, these bears just tune 'em out.
Oh well, we're sure the bear corpses piling up will force an evolutionary adaptation eventually. Just not today, it seems.