Rule Supplement 1: Mounted Combat

From publisher blurb:

Rule Supplement 1: Mounted Combat is the most complete and authoritative resource for mounts and mounted combat in the D20 System. It includes rules for:

Flying mounts
Burrowing mounts
Climbing mounts
Swimming mounts
Large and small mounts
Intelligent mounts
Multiple riders
Riding platforms
Cavalry maneuvers
Warpacks
Contest Jousting
And more!

Inside you’ll also find new equipment, dozens of new skill uses, expanded descriptions of the Handle Animal and Ride skills, and more than 50 feats, along with all the rules you’ll ever need for riding a mount -- no need to flip back and forth between the core rulebooks!