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Biology

Physiological Adaptations for Deep-Sea Gigantism in Cephalopods

Quick fact

The colossal squid (Mesonychoteuthis hamiltoni) is the largest invertebrate on Earth, with an estimated length of up to 14 meters and a weight of nearly 500 kilograms—yet it thrives in the cold, dark waters of the Southern Ocean, where food is scarce.

Why this is interesting

Imagine a squid with eyes the size of dinner plates and tentacles that could wrap around a small car. That's the colossal squid—and its sheer size is no accident of nature. What allows these deep-sea giants to grow so enormous?