Just kill and get the raw polymer. Please don't try to tame. (will take 3 hours).

If you’re on Valguero or another map with Deinonychus nests, those eggs are probably the easiest to come across and eggs under lvl 130 aren’t good for anything else anyway

Build a pen to lock them in and then bring fish to it to tame and earn yourself a golden egg to make kibble

Can use their eggs to make oil in cooker. Tame a bunch of females and a male to have a passive oil farm. Plus use a female to kill 5 fish and have a chance at getting a golden egg which you can give to yourself or your tames for an xp buff. Big creatures dont receive as much of an xp bonus. Golden eggs can be used for extraordinary kibble but I personally just use yutys for that

He's use is mainly natural polymer for me at least

If you are force taming, these guys need to be awake for the command to work. It is cheap but trust me you probably don’t want to do an hour long fetch quest for it.

Side note; the hespers have an instant kill attack on fish.

Can’t tame in snow cave on extinction.

Lasso, drag onto a trap boat, then ride around to the fish. Bigger the fish, faster the tame.

Feeding them sabertooth salmon seems to work the best.

I was starting out and I killed one of these because they would attacking me then I saw two and tried to tame the female which I did but then it just deleted my save (one tip if you don’t want it to hurt you have a fish in your hands like your carrying a fish)

Of you want to tame one of these I've noticed that they sometimes they come to you like dolphins if you have fish on the final hotbar spot, might be good to keep in mind if you are having trouble lugging a giant fish around with you.

Use an otter or itchyothornis to collect fish for you then go to the hesperornis and feed it the collected fish. They love sabertooth salmon so target those.

This guy needs to get buffed desperately...

Maybe make them lay a Golden Egg for every 3 fish killed instead of 5?

Even though on the wiki it says its a small egg type that makes simple kibble, the regular egg will NOT make kibble. The reason for this is that if you cook the egg without the other ongredients it turns into oil. This mechanic overlaps with the new kibble system and as such, it turns into oil before if can become kibble.

Dodo 2.0 is this cuz it poops gold eggs

A quick way to get ok amounts of organic polmer on genises part 1 in Ocean biom use bloodstakler and kill it for what it is.

This tame is not affected by game settings for some reason, I made the tame speed 99999, so insta tame basically but there not affected

Great for making gillie I have 10 sets

You can easily kill for polmor

The eggs produce oil in the cooker. Well worth the effort.