Me and my friend spotted a level 90 tek quetzal near the redwoods and the swamp. He picked me up with an Argy and I shot it with tranqs. Of course, it got knocked out right over the river. We were so mad. We took a look in its inventory and saw that it wasn’t losing oxygen. I guess the game glitched or something, because it was submerged and it still didn’t die. We were able to tame it. Perhaps tek creatures don’t lose oxygen because they can’t breathe? Idk.