Moray Eel

Photo: Dennis Rabeling · CC BY-NC-ND

Mediterranean moray eels reach densities in Gran Canaria's lava tunnels that rival Mediterranean marine reserves — every substantial crevice around La Catedral's entrance and exit hides at least one individual, with large adults exceeding 1.2 metres frequently draping themselves across the opening stones. They are predominantly nocturnal hunters that pursue octopus and fish by scent through the tunnel labyrinth, relying on their remarkable sense of smell because eyesight is limited in the low-light interior. Their skin is free of scales and coated in toxic mucus, an adaptation that also helps them glide through tight volcanic passages without injury.