i still say rats! as for wild animals taking easy option,rats are no differnt than fox mink they will kill for fun seen it for years, them taking poults chicks and aviery birds killing the lot or whatever they can catch. Obviosly a fully grown old rat/rats will be harder to trap than young ones and if lots of food around including poults,they even be reluctant to take poisen bait. After they have paid a visit normaly leave it a day or so befor they return, make no mistake they will!