Use an itchthyornis to gather fish for it. The buff increases efficiency.

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

Feeding them sabertooth salmon seems to work the best.

Taming an ichthyornis will allow you to gather the corpse by setting it on hunt and retrieve, after the fish is killed it will deliver the corpse right to you and you can tame the Hesperornis

Use a horse to lasso it, then you can move it around to new fish spawns when the area gets cleared. The horse can also step on the duck to pin it down, or simply use the lasso to keep it close while tribemates gather fish.

Can't be picked up by anything while they are wild. They do aggro on you, and can walk through door frames, so you can kite them to a taming pen then use an itchy to bring those succulent salmon to you. Tamed a 140 last night in about 20 minutes.

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

I picked it up with a grappling hook, then jumped on my wyvern & flew it to a safer place to tame with lots of salmon. I also threw a tent over it to stop it from wandering off. Best way to tame. So much easier.

Feeding them sabertooth salmon seems to work the best.

If you insist on taming one without an Ichthythornis, a good thing to be aware of is that the Hesperonis will sometimes be unable to eat a fish it kills, swimming back and forth to try and "find" it.
You can pick up a fish it's killed and feed it to it, and it counts for tame progress.
Also be aware that if you drop a fish you've killed, it can eat your fish off the floor and it will not give tame progress.

Can’t tame in snow cave on extinction.

The best way to tame it is to get fishes from a Ichtyornis. Salmons are the best.

Tame a icthycornis and make it grab a fish it works way better in fact that is the correct way to do it or intended

They are affected by small bear traps so just build walls around them so they can’t escape

To get fertilized eggs, they must be on wandering in water. They wouldnt mate onland, only when I put them in water. Just attach them to a hitching post in the water.

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.

IT'S KEVIN!!!! Kevin likes chocolate and eats balloons :P

Lure with honey to a trap. Then with a rex kill nearby fish and drag body to it. When ur close and still dragging fish it will say feed it fish. Y ON XBOX

Breeding seems to take about 28 hours.3.5hr egg 3hr baby.

Use a seagull to gather the fish you need for it!! Just get your seagull to kill the fish and bring it to you, then you feed the duck