Micro raptors spawn in forests and redwood forests. I've found they are more common during the evening, dusk, dawn, and night. When searching, walk slowly on a mount, I use a spoon, and have a spyglass. Look for a dino that will look kinda like a turkey mixed with a troodon. Hop off your mount and sneak up to it and tranq it. 1 rare flower later you have yourself a microraptor.
These little guys normally see you before you spot them. But go into an area with a good horse and when they start to circle you to try and knock you....start kicking! I actually Ko'd one at random and tamed her up. Actually a beautiful baby I named Fifi, a suitable name for an ankle-biter! XD