He shares the same model and color as only one other cat in the game, that cat is Pitch who can be found in Sholazar Basin. Pitch however is only tamable at level 76, making humar still quite desirable for low level hunters to tame.
Humar the Pridelord can be found with NPCScan. You will need to add it, his NPCScan ID is 5828.
You don't really need npcscan to find Humar though. He spawns in only one location (under the huge tree) and he doesn't patrol away from it.
Before the Cataclysm his spawn timer was quite long, I remember people used to camp for this guy for hours on end. I think it has since been drastically reduced though, as I see him up almost every time I fly past the area.
Although there are many rares in Northern Barrens (I will not cover all of them), three of them are tamable by hunters. Those three are:
- Dishu, level 13 cat, Looks like druid travel form
- Humar the Pridelord, level 18 cat, (Black Lion)
- Takk the Leaper, level 14 Grey Raptor
(Also, for anyone interested, Erinys of the Harpy's Nest Blog wrote up an amazing story about Humar the Pridelord for my 1st Blogiversary Contest. It's a beautiful story about the bond between hunter and pet and is definitely worth a read if you have a couple of minutes to spare. You can read her story on this post.)