this post was submitted on 30 May 2024
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A lot of animals use pheromones to communicate details about themselves in a far more complex way than we could by smelling.
I think some of the peacock spiders, despite being already visually stunning, actually have UV light reflective surfaces (as well as the abililty to see UV) and use those in their mating display. So even while not being able to generate UV light they still use it to communicate in a way that we couldn't percieve. It might be a bit of a stretch, but in general you could communicate by manipulating/reflecting natural radio background waves, just as many animals do it with visible (or invisible) light.