When archaeologists uncovered a medieval grave on the island of Chapelle Dom Hue, off the west coast of Guernsey in the Channel Islands, they expected to find the remains of a long-departed human. Instead, they found a properly buried porpoise.

The grave, carefully cut into the rocky soil on a high point of the island overlooking the sea, was constructed with the same techniques used for human graves. It takes up valuable real estate on the small island. So what’s the explanation? At this point, researchers only have theories.

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