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It may sound wasted, but if they truly do rely on the calling signal as a visual cue, then I'd actually chalk it up to an evolutionary advantage. If they relied on sound, it could be hard to hear each other over the sound of the rainforest, but being able to see that throat movement and communicate in a noisy environment is an interesting adaptation!

I see you like the weird critters too! I gave you a follow; the weirder the better!

And yes weird critters is my thing XD Thanks for the follow, already a follower of yours for a few days now ^__^

If that is what actually happened, yes it's true. Whatever the reason behind this trait, it's a cool little critter . ^__^