Optical Adaptations Allow Colossal Squid to Detect Large Moving Objects in Darkness

The colossal squid's visual system is tuned not just for light, but for motion.

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Research suggests the squid's eye size may specifically enhance detection of approaching sperm whales.

Large eyes combined with specialized retinal structures enhance sensitivity to subtle changes in light patterns caused by moving animals in deep Antarctic waters.

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Detecting motion rather than detail is advantageous in the aphotic zone, where bioluminescent disturbances provide critical survival cues.

These optical refinements demonstrate how sensory evolution prioritizes function over visual sharpness in perpetual darkness.

Source

Proceedings of the Royal Society B

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