We made a run through the legendary cows and chickens last night and found acouple of problems.
1. xp for cows is insane. Last cow gave 67,000 (nice bonus but way over kill)
2. xp for chickens sucks. The cows are the first "qwest" and there worth way more then chickens.
3. The keys to the cows and chickens is remaining in inventory even after you complete both "qwests" (run through the cows 6 or 7 times and your lv 40 in no time.
The cows seem to have a sweet spot for what level you take them at. Most i have gotten for 1 legendary cow (not boss) was 1,700 a piece. I think i was level 23, then after that they dropped a bit, but still dam good xp and the boss cow....dam 

I've adjusted the CR on all of these--they still will be good rewards, but not great hopefully. Super Cow was adjusted drastically (from CR 54 to CR 24). Ancient chicken is CR 27, by comparison.
Every creature has an
XP "sweet spot", it's how the
XP system works. If your lvl is +/- 7 or more than the CRE, you get a lot less more than 7 above, you get 5XP total.
About the key not disappearing: this is intentional. You can only get the quest and
XP once. The feathers and the super cow hide(s) are used in some CNR recipes, so you'll need to go back here. Without the quest
XP, it's merely a good encounter zone, nothing more. If you plan on crafting, do NOT throw away your key(s).
Edited by horred the plague, 07 April 2005 - 11:00 AM.