When I put my chicks up i saw some reddish brown thing like a long tubular rat scamper across the ground. It was outside of my welded wire fencing but i fear that it could squeeze in and wreak havoc. The chicks sleep inside of a cement block building. But there are vent holes that are covered with vent grates. It could possibly push the grates out and weasel on in making their home a cement tomb. Alternately, if i let them out to their pen tomorrow he could squeeze through the wire and have a destructive feast. I imagine i need something like large rat traps. I can also get some rat poison I imagine. Any other suggestions?