Much more annoying than Ichthyornis in my opinion. Been pounced by these many times off of my Baryonyx and nearly got shredded by a Compy gang. Their small size (barely larger than a Compy) doesn’t help either.
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.