Free-range feeders

Curare yes - or quaff some ayahuasca and raise the rat zombie army again to hunt down the infidels.

Ha! our german shepherd, big snow white male topped out at about 125 or more was terrified of mice or rats...you'd trip over him fleeing to cower in the bedroom if one got in the house LOL....on the upside our female cat (passed on last year at the ripe old age of 18) made her last official "kill" just after she turned 17...poor ole lady brought me the wee beastie as her teeth were too dull to do the job...wierd tho for a hunting female she would never touch our pet hamsters even when one escaped and hid out in her covered litter box (now that ladies and gents is one duuuuuuuumb hamster!)

Err edit that...one doesn't "trip" over a shepherd that size...one is "bowled over" by a shepherd that size LOL

Actual advice here (rather than my usual goofy ramblings). If any of our rats get loose for some reason making a little tic tic sound (put your tongue against the roof of your mouth and click it) seems irrestible to them. They just can't help but come out and see what is making that sound. Sit still, make the tic tic sound and then grab em quick when they get close enough. Works everytime for me. Don't laugh but for some odd reason rats love me and always come to that sound (or is it the peanut butter dabbed behind my ears LOL...dang goofy again!)

You'll think I have no life when I say this... but catching escapee rats can be fun! I had one of my males get out a few months ago, and my cat and I made a game outta hunting him down and finally getting him alive. I did not want him killed off, since he was a great producer.
I have never worked in a team situation with a cat before, but he seriously was a big help. The rat got under our washing machine, and Inky the kitty would run to one side, and the rat would run toward me on the other side, and finally I grabbed the sucker's tail and nabbed him.