Birdwatch Note Rating
2024-01-17 22:27:35 UTC - HELPFUL
Rated by Participant: 6FB88A38649183E97FBF56782F2A4EA31A54145105F91758BCA256F338C702E8
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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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