User blog comment:YoshinatorZ/Rengar Talk Page/@comment-72.227.86.137-20120810182709

If anything, while jungling. Ferocity W > Ferocity Q. Only if you're low though and have no Lifesteal. If not, Q is the better choice. Double Attack Speed and an on hit burst is pretty good.

I have to say though, cooldown reduction can be crazy good for him late game. He can have his Ult on a 24s cooldown if I did my numbers right. 4000 range of seeing people for 7 seconds, every 24 seconds.

Also, his name is an anagram for Ranger. (Such as hunters using guns/bows to get their game/prey.)