I literally find hundreds just chillin on trees in the redwoods. It's really helpful to make a tree platform and just wait until one lands on your tree and then shoot it with tranqs. It's much easier then trying to shoot one from the ground, and trying to find it once it's knocked out.
Alright, so basically I found one of these in the wild and REALLY wanted one. But with all the fun things in the Redwoods willing to take out anything that looks at them... Well you get the idea. But when I went to a dungeon and saw a Eerie one I wanted it SO bad. So I killed that one took its creature implant, revived it at one of the obelisks and tamed that glory bird up. Now I have a light up parachute!