Raven Blackwell
Mongoose
Byhakee are listed in the Call of Cthulhu main rulebook as having human range Intelligence and Power [this is Wisdom in the Conan system] and capable of using magic which means they are sentient beings. Thus I borrowed a page from the Decipher's inferior Tolkien RPG The Lord of the Rings (1) which gave sentient mounts like Elven Steeds and Shadowfax ranks in the Ride skill which could substituted for their rider's skill or to travel without a rider if it came to it. After all a sentient mount could assist a person mouting them, help them to dismount [willingly or no], push itself while travelling, fight while carrying a rider, attempt to avoid pitfalls by itself through rough terrain, etc. Their Ride skill represents their ability to do so. Recall Frodo clinging to Asaloth in the writen version of The Fellowship of the Ring. Frodo didn't likely have more than a single rank or two in Ride but Asaloth was the one making the skill checks there allowing them to pass through difficult terrain ahead of the Black Riders. In all of the Mythos tales involving Byhakee I've read their riders usually just hung on for dear life like Frodo and left the driving to the Elder Horror.
As far as maneuverability is concerned Conan doesn't seem to use it. Flying creatures are just listed with a Fly speed. If you want to substitue 3.5 rules for flying Byhakee are likely like Mi-Go in that their wings are better suited to the Outer Dark than terrestrial atmospheres so they would have Average maneuverability- or worse.
(1) For the real Tolkien RPG see the long out of print Middle Earth Role Playing [MERP] once put out by the non defunct Iron Crown Enterprises [ICE] and the Vala help you in your search. I haven't seen these books for years.....
As far as maneuverability is concerned Conan doesn't seem to use it. Flying creatures are just listed with a Fly speed. If you want to substitue 3.5 rules for flying Byhakee are likely like Mi-Go in that their wings are better suited to the Outer Dark than terrestrial atmospheres so they would have Average maneuverability- or worse.
(1) For the real Tolkien RPG see the long out of print Middle Earth Role Playing [MERP] once put out by the non defunct Iron Crown Enterprises [ICE] and the Vala help you in your search. I haven't seen these books for years.....