Though commonly mistaken for Archeopteryx, the difference between the two theropods is the microraptors blinding speed, and ability to leap up into the air and orbit the player until stunning them and dismounting them from any creature they're on. Keep an eye on the bushes and trees, they can be anywhere in the redwoods forest.
They seem to only be aggressive when you are on your mount. Dismount before approaching or else you will find your self thrown off and Stunned. Walking forward and backwards quickly allows you to "hula hoop" an attacking Micro, giving you time to dismount and avoid the stun.
I hear on standard servers it only takes 1 rare flower to tame a 150. I can confirm it does at 2.5 (5x old rates) rates at least. Also they look almost identical to Archas almost, especially at a distance or while mounted.