The colossal squid (Mesonychoteuthis hamiltoni) has the largest eyes of any sea creature, with an estimated diameter of 30–40 cm (12–16 in). These are possibly the largest eyes that have ever existed during the history of the animal kingdom. They require such large eyes to see and hunt in depths estimated to range from 1000 to 2000 meters below the ocean's surface. The colossal squid's eyes also glow in the dark via long rectangularly shaped light-producing photophores next to the lens on the front of both eyeballs. Symbiotic bacteria reside within these photophores and luminesce through chemical reactions. It is hypothesised that the colossal squid's eyes can detect predator movement beyond 120 m, which is the upper limit of the sperm whale's sonar range.
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