Put a tracking device on it, if you die while he is on your shoulder it runs away to a safe location where that is no-one knows lol. Btw if you see Wilson tell him it's safe to come home now... WILSON!!!
They live in the old railway cave which is located in the fertile outside of the portal, you can’t bring any Dinos with you so bring a sword, a shotgun with bullets, zip lines, climbing picks and/or motorized zip line attachment and armor with an extra set. Once you find one they are tamed with the black mushrooms, don’t turn them on in the cave though because that only attracts the ravagers raptors and seekers. And, while you’re in the cave why not pick up the artifact? Also karkinos spawn in the cave so be prepared for those.
Throw down some sleeping bags in the cave and catch a low level anything and us them as a vault for glow sticks and climbing pick,then c carrying nothing run through and have all the bad things chase you and the glowtail will stay there, then come back after revive and tame yourself glowtail