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Worldbuilding

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    $\begingroup$ There was another question recently about albatross chicks vomiting up stomach grease on attackers. That's another option for a projectile weapon. $\endgroup$
    – Daron
    Commented Mar 28, 2022 at 18:03
  • $\begingroup$ Or spitting poison, like Spitting Cobras. $\endgroup$
    – c1moore
    Commented Mar 29, 2022 at 3:04
  • $\begingroup$ Or if you want something even closer to breathing fire, have a look at what bombardier beetles do. Unfortunately, it probably wouldn't evolve in vertebrates so it might be hard (as in "not doable") to genetically engineer. @Daron's idea about vomiting is probably more realistic, concentrated stomach acid probably burns pretty good (vultures have very strong stomach acid to kill of nasty stuff in the carrion they eat, for example) - but if you want to add some bombardier beetle-like spice to it, the vomit could be complemented by a spray of something alkaline to produce an "acid bomb". $\endgroup$
    – gustafc
    Commented Mar 29, 2022 at 8:33