Oh, Chickens vs. Squirrels!!!
Obviously Squirrels - because they could store vast amounts of chicken feed in their elastic-like mouths to lure the gullible chickens to beneath the tree habitats of the mighty Squirrel Battalions, where they will reign down a massive shower of pre-stored winter pine-cones, of the likes that would create such a immense shadow in the skies it would darken the sun for at least 6 seconds blinding the chickens until they are buried, thus immobilizing the once-feared Chicken Army of the Northern Prairies.