Reminds me of a story about a simulator the Australian Army (may have been Air Force at the time) had for their helicopters, they wanted to add kangaroos to it as operating near them causes them to stampede away creating a dust cloud which is a bit of a give away to the opposing side.
Demo day came and the team from the sim manufacturer were showing off how flying low near the kangaroos caused them to run away and create a cloud of dust. Shortly afterwards the kangaroos regrouped, came back towards the helicopter and shoot it down with a Stinger missile. It turns out if you create kangaroos by replacing the visual model for ground troops you should probably remember to disarm them...