Main Page | See live article | Alphabetical index Muff/beard is a mutation found in chickens which causes extra feathering under the chicken's face, giving the appearance of a beard. Variously called 'muff and beard', 'tuff and beard' or just 'beard'. The terms muff and tuff are given to the seemingly separate regions closer up on sides of the head. This trait can be found in many chicken breeds. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.