The birders have gone “cuckoo.”

A swarm of birders flocked to Long Island after an exceptionally rare cuckoo bird was spotted by a golfer, according to reports.

Hundreds of people traveled from dozens of states to Vineyards Golf and Country Club in Riverhead, starting Thursday, for the chance to see the “common cuckoo,” first detected by Roy William Gardner as he was in a golf cart moving through holes, CBS News reported.

The cuckoo, which has been spotted only four times in the mainland US in history, is native to Europe and winters in Africa.

Gardner snapped a pic of the bird and texted photos to his nephew, who is an ornithologist from Cornell and now a bird biologist at UCLA, the outlet reported.

“It’s pretty amazing that my uncle, who’s a non-birder, can send a text message acro

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