A bizarre sea creature has set the internet ablaze with speculation. Nobody seems to know what the animal is.

A Scottish tourist captured the unidentifiable marine animal while vacationing in Greece. Fox 5 NY reports that Harvey Robertson was on a boat cruise as they sailed through the sea caves off the coast of Parga. Robertson said he was initially just trying to capture the unusual color of the surrounding water with his iPhone.

Instead Robertson captured a picture that has stumped everyone including marine scientists. Looking back through his camera, Robertson saw that he had taken a pic of a gray creature that resembles an elongated manatee. The strange animal reportedly stuck its head out of the water in one photo, then disappears under the greenish water in the next.

Some have speculated it could be a Cuvier’s beaked whale, which have been known to frequent the Mediterranean. Others jokingly said it could be a cross between a hippo and a crocodile.

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