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I had an idea of a flying alien creature on a low gravity planet that would hunt in a unique way.

It would evolve a biological gun on its forehead.

Is such a thing plausible? If not, why?

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    $\begingroup$ Welcome to worldbuilding. Your question is answered by the answer given in the referred post citing the squirting cucumber. $\endgroup$
    – L.Dutch ♦
    Apr 10, 2020 at 8:12
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    $\begingroup$ I think this is not a duplicate. The other question is about exploding fruots. I have an answer for this one. $\endgroup$
    – The Square-Cube Law
    Apr 10, 2020 at 14:49
  • $\begingroup$ Check out the Bombardier Beetle. It's butt is basically a steam cannon. Or something like a slingshot/bow, only with that weird stuff fleas and mantis shrimp use to store energy and release it all real fast. A mantis shrimp's punch accelerates as fast as a .22 round in the barrel, WHILE UNDERWATER. Take that and throw in some porcupine quills, and you've got an animal that can shoot its spines and has plenty to shoot. $\endgroup$
    – Mark Storer
    Apr 10, 2020 at 17:58
  • $\begingroup$ IMHO, this is no more far-fetched than Larry Niven's Stage Trees. See the story, "A Relic of the Empire" URL discussing it here: larryniven.fandom.com/wiki/A_Relic_of_the_Empire $\endgroup$
    – Catalyst
    Jul 7, 2020 at 5:07
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    $\begingroup$ @TheSquare-CubeLaw See new post:worldbuilding.stackexchange.com/questions/246477/…. I'm voting to reopen this one as "nowhere near a duplicate of the other". $\endgroup$
    – Escaped dental patient.
    May 23 at 17:40

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Nature has already done it

termite with fontanellar gun

This is a nasute termite, which bears a fontanellar gun on its forehead. This is a highly derived structure which fires a 'bullet' of sticky substance which immobilises attackers. While this structure specifically is for defense, many creatures (e.g. velvet worms or spitting spiders) which use sticky projectiles to hunt

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  • $\begingroup$ Doesn't seem much different than spitting. Now that I think about it, there's plenty of spitting animals. $\endgroup$
    – fredsbend
    Jun 8 at 2:27

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