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Something strange is going on at Bryan Park, where a duck and goose have been BFFs — best feathered friends — for more than a year.

The white domestic duck and white domestic goose rarely part, but experts say they can’t mate because they are of different species.

So why is the duck sitting on eggs while the goose faithfully keeps watch nearby?

“I think they had a visitor,” said Sally Chamberlin, who lives near the North Richmond park and likes to check on the pair.

If that’s the case, there’s no sign of the interloper.

At the park Wednesday, Brianna Holt, 12, and her father, Bryan, watched the odd bird couple. Brianna called the goose Horn, because he has a bump in his bill, and the duck Snow.

Snow sat on her nest on an artificial island in a pond at the park while Horn paddled around the island. When a Canada goose stepped onto the island, Horn chased it off.

“That’s mine!” Brianna said, as if speaking for Horn.

Later, Horn chased away a mallard that seemed to be minding its business on a log several yards away.