Don't tranq it... the dex doesn't tell you that for some reason... drag fish to it and press the interact button to feed it.
Hesperornis
Hesperornis is a fish-hunting waterbird prized for its valuable eggs: regular eggs can yield oil, while golden eggs are used to make Extraordinary Kibble.

Player-written tips for taming, using, and fighting the Hesperornis in ARK: Survival Ascended & Evolved.
Argies are decent for poly, it's not as good as a club or sword but you don't have to keep getting off and back on.
Followed one of these around as close as physically possible while holding a fish corpse. So close that the "feed fish" gray text was on screen, but never turned blue like when feeding a basilo. Also clicking the action buttons wouldn't feed it at 0 range. Woohoo…
Followed one of these around as close as physically possible while holding a fish corpse. So close that the "feed fish" gray text was on screen, but never turned blue like when feeding a basilo. Also clicking the action buttons wouldn't feed it at 0 range. Woohoo looks like I'll have to force tame it or spawn a tamaed one. I love having to use console commands to make up for developer durpery. That's probably why they're in the game tbh.
No, this isn’t a tip…. But I just got done taming one of these…. and it felt like I was in passionate of the Christ. I’m on Xbox a.k.a. Xbox controller.. this was a really torturous experience.
can be killed by therizno.
If you tame one it’s useless so just kill it
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Buy Titanfall 2
We neeeeeed more SUPPORT
(And more players)