Usualy when im trying to get a quest or achievment or looking for a rare mob or anything like that i use a /target <name> macro.
What i did was combined a /target macro with a raid target macro. you dont even need to be in a group.
this helps big time because you can see their marks through terrain and trees or pretty much anything. has ~60yd(guess) range too.
Here's the macro you need to run around spamming. I just run around the outskirts of Elwynn Forrest and its done within the first 3 tries.
Code:
/target wild turkey
/script if GetRaidTargetIndex("target")==nil then SetRaidTargetIcon("target",1) end