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5 months ago
Why would a creature with a similar lifestyle as seals, sea-lions and amphibians-living near water and diving for food-evolve bioluminescence?
These creatures are roughly the size of a dolphin or a california sea-lion, sapient or highly intelligent and social. They live near the ocean and swim to hunt for food, and can take dives 1-3 hundred meters deep.
Oct 11, 2022 at 19:59
Your creatures are pack hunters. They are primarily visual, like seals. They are not stealthy - their prey knows very well what these predators are doing.
Bioluminescence allows individuals to keep track of pack mates in the dark water and coordinate movements. That makes them more effective hunters and confers a fitness advantage.
The corollary to this - wavelengths need to be those least prone to scatter over distance and so would be long: far red. Maybe these creatures can see some way into the infrared.
Oct 11, 2022 at 21:06
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