I’m on Ark Mobile so it may be different for some of u guys, but how I found these was in swamps, of course, take a flier that can carry one of these bad boys and take them somewhere safe since I can barely find them due to being killed easily, I have a taming area at my base so I carried them there. Once you have them there it’s safe to knock them out, and since these guys don’t attack it’s not gonna be too hard, their torpor doesn’t go down too quickly but not too slowly so your in the clear to go do something quickly. After that you can ride these guys in the water with almost infinite oxygen when on them!