Yes there is.. and no its not like secret cow lvl at all. It is a place to do magic find. There are a bunch of chickens and each one drops about 10 items and gold and shit and the way you get into it is by going to the last place and finding the secret landing where u put the newbie sword and the fury's eye and the tomb down and it opens up the chicken lvl. I havent done it enough to remember the exact directions so if u need them i can get them from my friend.
Newbie sword is the sword you start out with.. and Randuin... each chicken drops many many items, the cow kind drops like one decent item if your lucky. You can't gain exp from the chicken level thats the only problem.
Well I havent gotten any really amazing items yet but all the items I use were found in the chicken level, so there are the best ive got.. like my armor which is like 600 def and it has +3 to str( str is really important in this game), and all sorts of other cool stuff. My friend found like one of the better 1 handed weapons in the game and its like 450 max dmg, fas, its pretty nice