are you saying you want to mount a priest or griffon
Alliance can have owl mount while Horde can have eagle mount.
or what if the horde have vulture mount???
you can farm mounts?
I want an owl mount now 
A snowy owl would be perfect. And no, please nothing like the priest mounts from legion, they are ugly as funds heaters this is the word auto picked and I’m leaving it.
what is a preist mount
An owl mount hey?
There is already a vulture mount, it’s in BFA.
Waste Marauder - Item - World of Warcraft (wowhead.com)
Yes, except for AOTC mounts, raid and dungeon achievement mounts you need a group for. AOTC is exclusive to raids and expansions.
This guide should help a bit.
Warcraft Mounts: A field guide to mounts in the World of Warcraft.
I wouldn’t mind a Owl mount that talks like Hooty from Owl House 
what if annoys u