The moa is a dire threat.

Perhaps the most repugnant creature ever to have set foot on this planet - the moa. Oh, and don't even get me started on their feet! They're like fucking reptilian battering rams or some shit. Damn. Allow me, if you will, a moment to compose myself before proceeding ... This 10-foot tall (um, did I mention that some have been known to sprout up to 13-feet? Yeah ... That's, like, I don't even know, man!) 550 pound monstrosity was spit, forthwith, from the raging infernos of hell with but one thing on it's black agenda: apocalyptic mayhem. In its burning, blood-shot eyes you can see reflected the face of Lucifer. Herbivore? Yeah right. I don't believe it for one second. Their grotesquely immense, feathered bodies are stained with human blood. NO! You don't want to ride 'em! Get that shit outta here! The moa has long been synonymous with planetary holocaust. Equipped, from birth, with the aptitude to cast black magic spells, this repulsive, loathsome biped will not hesitate to hypnotize you, lure you into it's sanctum, conduct degrading, intrusive pseudoscientific experiments on your limp and lifeless body, and terminate you by tearing you limb from defenseless limb.

Arm yourselves appropriately.
May I suggest Google searching "gatling guns"?

God bless our valiant warrior heroes:
the Māori people, for hunting them into "extinction", and the Haast's eagle - their sworn adversary.

Your gallantry will not soon be forgotten.