(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