It's four male mallards. I thought it was weird that they're all male so I looked it up and apparently after the mating season, the males leave the bitches to deal with everything and they just fuck off and hang with their bros all summer long. I've never noticed that, but it's hilarious. These four guys show up as the sun's going down and just walk around my yard bullshitting for a bit and then they fly even further away from water. I wonder what they're doing right now. Probably buying coke or something.