Deep-sea eyesSourced
One squid, two very different eyes
Histioteuthis heteropsis, the strawberry squid, starts life with similar eyes. Its left eye grows larger. Observational research found that the larger eye points upwards towards dim sunlight, while the smaller one looks down towards bioluminescence.
Two windows on one animal face different lighting conditions.
Summary / translation: Unbubly · CC BY-SA 4.0
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Histioteuthis heteropsis · Wikimedia contributors
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Reviewed: 2026-10-10