3 of my 7 chickens have "bloody noses"

[alibutton]

Three of my 7 hens have bloody nostrils. I thought one had been picked on but I am wondering if it could be something else now that it is three.

 

[ChickensAreSweet]

"Blood-tinged exudates and serum clots are expelled from the trachea of affected birds."
http://edis.ifas.ufl.edu/ps044
diagnosis charts at bottom

You may want to check out IL.
http://www.merckvetmanual.com/mvm/index.jsp?cfile=htm/bc/206700.htm