Fans grieve for Flaco the owl in New York City.

– Flaco, the Eurasian eagle-owl, was a beloved celebrity in NYC.

– Fans gathered for a memorial in Central Park near his favourite oak tree.

– Found dead on Feb. 23, likely from hitting a building.

– Zoologists found traumatic impact injuries; further tests pending.

– Flaco's daily movements were documented by birders and admired by many.

– Admirers shared photos and videos of the majestic owl.

– He had a nearly 6-foot wingspan and was seen perched in various urban spots.

– Flaco's death was a heartbreaking loss for his followers.

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