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The Cambridge researchers attached 3D plastic models of trumpetfish and parrotfish to a wire pulley system and deployed them inside a colony of damselfish.

The scientists began by pulling only the 3D parrotfish over the damselfish habitat.

Similarly, when the trumpetfish model was attached to the side of a parrotfish model and pulled past the damselfish, the fish did not flee.

The study examined sites around the Chagos Archipelago in the Indian Ocean, focusing on a small fish known as the jewel damselfish.

We swam under a rock arch and through a short tunnel as damselfish, and ornate wrasse glided by in a mesmerizing parade.