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.