A flock of geese, seen on the Amusement Park planet.
A goose is a type of bird native to the planet Earth.
In 1996, after Rain Robinson discovered a UFO in Earth's orbit, Henry Starling attempted to downplay the discovery by noting that it was probably a flock of geese. Robinson disagreed, as flocks of geese don't park themselves 20,000 kilometers in orbit above Earth. (VOY: "Future's End")
A flock of geese flew across the sky of the Amusement Park planet when Captain Kirk visited the planet in 2267. (TOS: "Shore Leave")