Chick Invasion

The demand for food is a ceaseless skyrocket as the human population grows, in turn weve mutated animals in ways we never thought possible. We wanted them to gain size, but failed to realize just how much their minds expanded along side. The chicken revolution has begun, they have contact with the aliens. The humans know theyve gone too far, but will they be able to stop the invasion? In the middle of the desert, with but a train by your side, with no mercy shown for them, the chickens show none...