The Evil Chicken Lair is a small cave consisting of four Black Dragons and one Baby Black dragon. You'll need to have started the Sir Amik Varze part of the Recipe for Disaster quest and use a raw chicken on the Evil Chicken statue in Zanaris (The Lost City) to enter the cave. If you want to kill the Baby Black Dragon you'll need to use a rope to get down to it. The cave includes many safe spots and black dragons. The cave isn't usually crowded and it's one of the best spots to kill black dragons. Click here for a map of the Evil Chicken Mine, showing the rocks.
Baby Black Dragon (Level 83) Black Dragon (Level 227)