A pair of Grey Squirrels (aka Tree Rats) hanging off the same feeder. They usually bicker like billy-o when they're in the same tree let alone be near each other; they get quite agressive and will chase each other out of the garden, screeching as they do so. We think there are a couple of Drays nearby, as we frequently see them arrive on the fence from opposite ends of the garden.
These 2 however, were hanging ether side of the peanut feeder quite happily gnawing away at the mesh and the peanuts.