Get a bunch of those 6"x12" glue plates from Home depot and put some nuts in the middle. Also peanut butter works. I have caught 3-foot long snakes, mice, rats, big spiders, etc with them. Once they touch the plate they are screwed, no matter how big they are. The snakes can drag it around but its just a matter of you finding them with the plate stuck to their face. Out in the country, ya gotta do what ya gotta do.
'68 428 HO M3 Monster, 4-on-the-floor! Need I say more?