Giant Squid May Number in the Millions Across the World’s Deep Oceans

Giant squid may number in the millions, inferred from the huge numbers of squid eaten by sperm whales in the deep ocean.

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Giant squid are among the least understood large animals in the ocean, partly because they spend much of their lives in deep water where direct observation is difficult. Scientists cannot simply count the worldwide population, so estimates have been built from indirect evidence, especially the squid remains found in sperm whale stomachs. Research has suggested that sperm whales may consume millions of giant squid each year, with older calculations producing much higher upper estimates. That does not mean scientists have a precise census of giant squid, and the exact global population remains uncertain. Giant squid are widespread and genetically very similar across distant parts of the ocean, suggesting that individuals can disperse over very large distances. Their huge, highly sensitive eyes may also help explain why they are difficult to observe with conventional deep-sea equipment. Bright lights, noise and the enormous size of the ocean make finding them particularly challenging. Modern cameras and less intrusive observation methods have improved what researchers can see, but the animal remains remarkably elusive. The basic picture is therefore both surprising and cautious: giant squid are probably far more numerous than the number of confirmed sightings suggests, but the true population size is still difficult to pin down.

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