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.

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.

Tamed it with cooked fish meat and missed my girlfriend's birthday and our wedding.

Put some rare flowers in your hotbar and have a strong flyer with you like a wyvern and start eating the flowers the quetz will follow you and you can lure him in a trap easy quetz tame