Or one that's just emerged from its pupa(?)
Disclaimer: I know nothing about the lifecycle of glow worms
Anyone else do a double-take at that thumbnail while quickly scrolling?
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Alrighty then, carry on
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I'm failing to see whatever it is you see, though I clicked through to the full size picture before looking at the thumbnail, so my view of the thumbnail was influenced by having seen the full size picture
Increased surface area. Only male glowworms metamorphose into adult forms and they use their feathery antennae to track females down by their pheromones. Increased antenna surface area helps them pick up those pheromones.