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MILAN, Italy — Venice has been charmed by a recent visitor: an acrobatic wild dolphin. The feeling appears to be mutual — he so far refuses to leave — but proximity to humans has put him in danger.

The dolphin nicknamed Mimmo has been delighting tourists and Venetians for months with his acrobatic flips. Experts are now eager to move him into open water, especially after verifying wounds indicating that the dolphin had likely been hit by a boat propeller.

Multiple agencies used low-intensity acoustic devices to nudge Mimmo away from the heavily trafficked St. Mark’s Basin on Saturday — and it worked briefly. But the dolphin came back within an hour, as experts feared he would.

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