To get up the mountain, go in the backside, suggesting the west side and climb from their.

This quest is helpful if you need more bag space. I recomend the bag if you aren't in immediate need of decent armor. In Wailing Caverns there are good leggings. That's just my advice.
P.S: Skin everything, perfect deviate scales worth good money.

I have submitted a few screen shots that will help a lot for finding the NPCs for turning in this quest.

But it will take some time while the screen shots get approved by the wowhead folks. I hope you like the screen shots.

Thank you.

u dont need to be on wailing caverns to do this quest
just grind outsind the instance.....same thing with https://vanillawowdb.com/?quest=962 https://vanillawowdb.com/?quest=962
since of patch 2.3 a lot of quests have been gone from hard to easy or even from east to noob prove.... hope this helps ya

Milesthirst is correct, but this is NOT a dungeon-nessicary quest. i found that you can get the deviate hides from the mobs OUTSIDE the instance in the big circular room.

This quest is also available to Alliance.

Be careful - when one of https://vanillawowdb.com/?item=6443 theses drops, anyone can loot it. It is not uncommon to see group members looting them in combat for that reason.
Edit: Link

Alliance Quests for Wailing Caverns

Since many people are trying out these low-level dungeons since the new dungeon tool appeared, perhaps for the first time, I thought it might be nice to make a summary of quests for WC for Alliance characters. Note that, for the Alliance, there isn't a quest for killing any of the bosses, although there is a quest triggered by a drop from the final boss.

Also note that since the mobs in the entry area (outside of the actual instance) are not elite, three of the four quests can be completed without actually grouping or entering the instance, as long as you're a high enough level to handle these non-elite mobs. On the other hand, since many people will be zoning directly in to the instance using the new tool, it's important to note that three of the four can be completed in the instance itself.

1. https://vanillawowdb.com/?quest=1487 Deviate Eradication - This is the only quest that actually requires entering the instance. The questgiver is located in the little cave above the entrance to Wailing Caverns. Follow the quest link for instructions on how to get into that cave. There are no pre-requisites to getting this quest.
2. https://vanillawowdb.com/?quest=1486 Deviate Hides - Also obtained from the cave outside WC. This quest can be completed either inside or outside the instance. Again, there is no pre-requisite for this quest.
3. https://vanillawowdb.com/?quest=1491 Smart Drinks - Obtained in Ratchet. There is a pre-requisite quest, https://vanillawowdb.com/?quest=865 Raptor Horns, given by the same questgiver, and which can be completed fairly quickly without leaving The Barrens. This quest (Smart Drinks) also can be completed either inside or outside the instance.
4. https://vanillawowdb.com/?quest=959 Trouble at the Docks - This quest is obtained in Ratchet. The target NPC is in the entry area for WC and thus outside the instance itself, meaning that while this quest can be completed without entering the instance, it's the only one of these four that cannot be completed if you zone in using the new dungeon tool.

In addition to these, there is one other quest that can be picked up within the instance. https://vanillawowdb.com/?quest=6981 The Glowing Shard is picked up by a drop from the final boss of WC, https://vanillawowdb.com/?npc=3654 Mutanus the Devourer. This eventually leads to another quest which finishes (for Alliance characters) in Darnassus.

i found a movie on utube much easyer to see where to go
http://www.youtube.com/watch?v=ktIyVepdtQg http://www.youtube.com/watch?v=ktIyVepdtQg

It looks like the quest givers have either been removed form the game or the quest have been move to another location.

Quest giver is now just inside the instance, and the mobs outside the instance no longer seem to drop the hides. Raptors/crocs inside the instance soloable by 25 Druid, with caution.