On the island map they are uncommon spawns in many places although the best place to find them is in the south east jungle and obelisk area. They can be used to tame solo tame a quetzal. Kill a few ducks to get some ghille (2-3 pieces will do) then shoot it in the head and afterwards just hit it with a few body shot and it’s will ko. Never go to close on your mount when you find one. Flying mount reccomended. if it is in the air follow it from far away and wait patiently for it to come down. If it only ascends then don’t bother and if it’s on the ground land a little far away then equip ghille and shoot. I hope this helped!
I found a lvl 70 and a 125 ( For me 150 is max ) near (kind of) the green Obelisk, as you come from the south where the river splits in 2, to the left is the swamp, go to the right until it splits again, that's where I found my 125, Also near the hill with a decent amount of metal on it to the south of the redwoods and swamp pretty much on the middle line I think, that's where I find them often