Honestly it just seems like a better idea to leave them untamed, they aren't worth the hassle, especially since the otter can be tamed with one salmon while this can take like 15. And its harder to get its eggs when its tamed, meanwhile the wild ones can leave eggs scattered on shores at least once a day. I'm probably not doing it right. Do you have to feed them the fish corpses or just raw fish? And how many corpses does it need? I need these answers.
What I did was use my Ichthyornis to Hunt fishes and bring the dead bodies for me.
Change his settings to "Hunt and retrieve", put him on your shoulder then you go swim. While you are swimming aim at The fish you want and double tap F (on PC). Ichthyornis will fly, kill the fish and bring the body to you.
Then you take the body to Hesperornis and feed it. Once you get used to it it's very fast and easy. I recommend following Hesp from behind so you dont need to adjust your aim all the time.
The most frustrating thing about taming these guys is not only do they take a lot of fish but the same button to feed them is the same button to drop the fish(i don’t know if it’s different in pc or ps4)and it’s constantly swinging around your face making it annoying because you’re constantly dropping it. Either make it so the controls to feed them are different then dropping it or make ur so it’s not constantly in ur face.
Tame to this kill fish and drag there body to it and once tamed if you feed them more dead fish corpses it will build up and lay a golden egg which is used as a buff to certain dinos or oil or a player buff
BIGGEST PAIN TO TAME EVER! have to get sabertooth fish kill them BUT do NOT harvest them you have to drag the body to it and feed it. Also good luck feeding it while the body is flailing everywhere in front of you. Also you CAN breed them.
don’t tame this guys. It’s Ito worth the effort. Seriously. You’re literally better off taming a breeding pair of yutyrannus for kibble eggs than taming this moron. Unless you’re in a very hoisted server I really don’t recommend.