Make a small building without a roof, preferably thatch, then get an argie or a pteranodon, go to the redwood river and scout around for the and otter, they don’t live in the swamp section though, then once found pick up the otter with your flying dino, then drop it into the small building you made, then kill a lot of sabertooth salmon, and then feed your otter raw prime fish meet, then soon you have a noodle!
If you have an Argy, fly over the otter and pick it up with the argy's beak ('C' on pc). Land the argy and let the otter hang out in its beak while you bring fish over. I found I needed to drop the fish and pick it back up to target the otter. After having done this by following around a scampering otter with a dead fish pinwheeling wildly in my hands for 10 minutes the first time, I will never ever attempt it again without my argy.
These little guys are so much easier to tame in mobile, but harder to find. You still need to kill a megipirahna, but you don’t need to grab its corpse to feed the otter. After harvesting its meat you can easily walk up to it and feed it until it’s tamed. It doesn’t run away in mobile, and I’m sure you can use any fish meat.
best to tame a ichthyornis and carry it with you when looking for one of these guys, put the ichthyornis on hunt and retrieve it will catch a fish and bring it back golden and will have a better taming affect to feed to otter, like this up its very important peeps must know :)))
(I’m on mobile) I just built a box without a lid (1 thatch foundation, 3 thatch walls, 1 thatch door and 1 thatch doorframe) by a lake so I could fish for fresh food to tame then I hopped on my pteranodon and I followed the river around the red woods (without the swamp) to find one of these lil guys and pick him up then took him to the box I made and put him in it. Turns out the for some reason the otter wanted COOKED fish… luckily I had some already so I just fed him that and some soothing balm and he tamed in about a minute. DO NOT READ THIS TIP THINKING ALL OTTERS EAT COOKED FISH IN MOBILE. Up if you found funny or helpful
Just push this cute lil creature in front of a giga and it'll have an existential crisis. Realising the path of destruction it left in its wake and deteriorate in front of the otters blue sparkly marble eyes
It is tamed in the same way as the Hesperornis, where you have to carry a dead fish to it. Larger fish, and those caught by Ichthyornis, apparently work better. Piranha are better than coelacanths for taming, and salmon are better than piranha.