Rats!!

[Scythe13]

Rats will zigzag through grass until they feel confident, and then you'll get rat runs. Until then don't waste too much time looking for runs. One of the best ways to spot a run is to get lower to the ground. Crouching is always a good way to make runs clearer, in my experience. "If you have chicken, you have rats." These are the words of my best made who looks after one of the top chicken farms in the UK (over 100'000 chickens on one site, and the other has around 70'000). After you kill a few with a rifle, they'll become gun-shy, and as soon as they hear a shot, the smarter ones will run away. Then you're trapped with just a load of very intelligent rats in the area.

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Totally forgot, if they're indoors, put a little sprinkle of flour on the floor, and they'll leave tracks in it. Sand will do the same outside.