(Mobile) I just got one of these at like lvl 45, here’s how I did it!

I used a ptera to aggro it by attacking, and then I simply lured it to a safe location, where I tranqed it out. Seriously, this method is almost too easy. All you need to do is peck at the argy if it loses interest, and you can take it anywhere! I only had the willpower to lure into a relatively safe patch of grass near the redwoods, but with enough skill you could probably do more than that.