To find the Evil Chicken, players must speak to the Wise Old Man in Draynor Village. The Book on chickens, found on one of his shelves, has further information about the beast. The Evil Chicken's Lair can then be accessed by using a raw chicken (an undead raw chicken won't work) on the Chicken Shrine in northern Zanaris, near the fairy ring. Players should be prepared to be attacked by level 100 black dragons guarding the lair and should wear or use a protection against its breath. The Evil Chicken can be found in the back of the lair, and will drop the Evil chicken's egg when it is killed.
While the destroy prompt may insinuate otherwise, all a player needs to do is enter the lair again and search the Evil Chicken's nest to get another egg; the Evil Chicken will not reappear nor will the player have to fight him again.