Do these things (Havahart box traps) actually work? So far a brand new "raccoon-size" (~12x12x36") unit is one-for-three on (I fear) the cat I really want to catch and the possums which devour all the food I put out to at least keep her around. They're dumb enough, I hope, that they'll fall for this as many times as it takes. But a semi-feral cat? Fat chance. I >could< manage to confront them across the feed bowl almost nightly, at chest height and point-blank range.... Unfortunately they're even more durable than they are dumb, and the thought of 15-20p of dead possum in a big back-door woodpile does not appeal. Let alone having to dispose of several hundred pounds of nosy neighbors and overinquisitive cops.... Ahem. Anyway, it looks to me like those big doors - even preloaded by slipping in sticks to hold them partway down, are just too slow once gravity takes over. More than looks like: even sitting inside hearing it trip as unexpectedly as the animal does, it seems like an awful lot of brain cycles go by before it actually slams to. Especially the passive-linked door, which just sits there forever until the tripped link comes about halfway up and relieves the friction on it. The "squirrel-size" one I got to trap the kittens last year is perceptibly faster - and works like the proverbial charm. Anyone had any experience with (any) live traps? Will the animals get scared off or gradually come to assume they can beat it until one day they don't? Will a squirrel-size trap still catch at least a smallish cat or half-grown possum? Is anything actually going to walk into a 36" long trap if I leave one door shut? Any other tips or tricks? Thanks in advance.