Plausibility of hollow horns?

I am working on creating a species where they have hollow horns (the horns have evolved to the point of being mostly for display and minor neck protection so they do not have to be super sturdy) so as to not weigh them down too much when jumping, gliding, and flying between trees. If it helps any, they are around the size of a cat, have hollow bones, are omnivorous mammals, and live on an isolated island humans have yet to find. Therefore they cannot come into contact with humans. So far I have yet to find any creatures with hollow horns.

So I am looking for a way for them to have hollow horns, without it being through gene editing from another species, and with it being plausible in science.

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Plausibility of hollow horns?

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