A dead goose fell from the sky and knocked a 51-year-old hunter unconscious in the US.

The incident happened in Easton, Maryland, near the Miles River about 5pm on Thursday.

Canada geese can weigh about 5½ kilograms and have a wing span reaching up to two metres. Credit:PETER POWER

Robert Meilhammer, of Crapo, Maryland, was hunting with three others for waterfowl when someone in the group fired on a flock of Canada geese overhead.

One of the geese fell and hit Meilhammer, knocking him out and causing head and facial injuries, said Candy Thomson, a spokeswoman for the Maryland Natural Resources Police.