Hey all, just found this nifty little place on my hunter. Its not hidden nor secreted, but I find there is usually very few people there.
The mobs are located in Thousand Needles, around 12,1
They are named Highperch Wyverns and they are between levels 27 and 29 - Highperch Consort - NPCs - World of Warcraft
There are about 40 of these guys in the camp, all of them with pretty low health, my 34 hunter downed them in about 8 or so seconds. They drop medium leather and hides ( ocassionaly heavy )
Just thought I'd share, its a great place to go. You can seriously farm tons of the stuff here, with minimal effort