A Muscovy duck greets me with excitement as I exited my car at a gas station today. I thought it was cute as heck cause while they are considered invasive and "dumb", they are just really chill and intelligent birds. Similar to a dog wagging its tail when its owner returns home, ducks wag their tails to show excitement. Some say that Muscovy ducks are especially expressive and wag their tails out of joy.