A bizarre-looking carcass washed ashore recently on a New Zealand beach, fueling speculation that it was some sort of sea monster.

This is because the head and teeth of the deteriorated corpse resembled that of something ferocious and prehistoric, while the rest of the creature was unidentifiable to beachgoers who made the discovery because of its state of decay.

A YouTube video described the carcass on Pukehina Beach in the Bay of Plenty as belonging to a “strange marine creature” and the uploader asked: “Can anyone identify what it is? It has a huge head and teeth with rudimentary flippers. It seems about 9 [meters] in length but the lower part of the body is probably mainly entrails from an attack.”

Finally, however, the mystery appears to have been solved. The sea monster, according to a marine mammal expert, was most likely simply a killer whale, or orca. (Killer whales are commonly seen in the Bay of Plenty.)

Anton van Helden told New Zealand’s Sun Live newspaper that his identification was based on the fin structure of the animal.