If you manage to knock a quetzal out, try starve taming. If you never tried starve taming it’s just leaving a Dino’s hunger go to half way or lower and then you start feeding. I’ve done this many times and it’s very useful taming trick.
If you drop a quetzal due to knockout, and it lands next to a giga...just know, the quetzal belong to the giga. Now you get to watch your would be quetzal get eaten by a giga. Now you can go home and cry.
This is the Way i do it in single player: kill it with a flying creature, tale it’s implant and build a cage around the obelisk , revial it and then tame it 👍 thats how i Got ond at lvl 52 and without any help😉 then the next broblem is to make a saddle😏