When playing on the Center, be warned that they are very DIFFICULT to find because they hide in the bushes. If you aren't careful, you'll probably get lost and die by the Carnos and Terror Birds that lurk in the Redwoods.
Usually found in and around the redwood forests, these little guys can be used as parachutes if you fall from a tame/ structure and save you dying. You will probably need a bola because although a passive creature it will fly to the nearest tree and latch on if you get too close
Go to the redwood, look at the trees they'll often fly from one tree to the next. It can take some time to find but when you do they spawn in bunches. Now here's a nifty trick. Not all "grab point" on tree work perfectly, if the archa can't grab the tree it'll just fall vertically to the ground for not only an easy time to tranq it, but also other archas might fall to the ground near the same spot when they come along to feed! I tamed 3 archa in one spot for the price of one (fourth one got away).
Careful about the wildlife especially the angry birds
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.
like most small to medium sized creatures, a decent lvl horse can knock them out quick before they can escape. nice utility tames (organic parachute) as far as encountering goes....well good luck distinguishing them from microraptors......