Birdwatch Note Rating
2024-01-17 13:46:43 UTC - HELPFUL
Rated by Participant: 51DE0187E60619A23C3486672F1604C1019E21949915C79D3CB963AADBE409E6
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Original Note:
Sea urchins, like their close relatives the sea stars (starfish), don't technically have eyes. Instead, the ball-like invertebrates detect light striking their spines and compare the beams intensities to get a sense of their surroundings. https://www.nationalgeographic.com/science/article/100205-sea-urchins-spines-eyes
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