Kill all low level quetzals you can find while a buddy hangs out around Craig's Island. Flying out towards the nearby blood red lake and then back allows the new wild Quetzals to spawn in. Two spawn in at the same time, if you only see one then there is another wild quetzal that you haven't killed yet.
The fun way is to jump off and grapple to your argie and whistle it to attack and since argies are slow it won’t catch up in time so tranq till it goes out also bring parachutes and consider liking so more people will know
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.