Tame a bad quetzal first lvl - 20 once tamed build a trap on him and with that quetzal tame other quetzal lvl +100 breed them and now you have quetzal factory :)
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.