you can make a bucket trap, this is a pic of one example (post #4), only you put water in it so they drown.
https://www.backyardchickens.com/forum/viewtopic.php?id=478055&p=1
There's another kind that you put a ramp up to it and make a layer of sumflower seeds that float to the top. The theory is that the rats think there's "ground" under the seeds and fall in and drown.
https://www.backyardchickens.com/forum/viewtopic.php?id=478055&p=1
There's another kind that you put a ramp up to it and make a layer of sumflower seeds that float to the top. The theory is that the rats think there's "ground" under the seeds and fall in and drown.