Birdwatch Note Rating
2024-01-17 17:25:40 UTC - HELPFUL
Rated by Participant: 3CA3018D01F6DFF4D0A87B52C22AE8A03DF40ABF95A09B58B0DDA605B6962600
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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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