The eyewitness, who first heard the animal splashing by the southeastern coast, said she couldn't believe her eyes.
Estonian ship pilot Indrek Sulla on Tuesday morning sighted two dolphins who had likely wandered into Kopli Bay from the Atlantic.
The Pallas's reed bunting has been sighted fewer than 10 times in Europe.
Sightings of great egrets have been reported for decades, but sightings this summer confirm the first time the species has nested in Finland.
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