Full-body bioluminescence
A creature I am imagining is a small mammal about the size of a domestic cat which - through symbiotic bacteria which live in its fur - is covered its whole body over in blue-white bioluminescence, 24-7.
Is there any reason why an animal would be bioluminescent all over its body rather than in just one part or a few parts? The light can't be "turned off". If you need to know; the creature is terrestrial and lives in a forest environment which is, for whatever reason, permanently in relative darkness. It eats fruit, nuts and the like, is social, and not physically dangerous to aggressors (at least when alive, it can be poisonous if necessary).
Note that the method of light production, mentioned above, is also open to change if it needs to do so to fit your answer.
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