Fig. 4From: Crossed beaks in a local Swiss chicken breedOccasionally observed anomalies of the rhamphotheca and nares in Appenzeller Barthuhn chickens with crossed beaks. a Overgrowth of the beak resulting in an instable brittle tip. b + c Deformed nares occur due to the bending of the upper beak at the height of the nares. Note that the nostril on the convex side of the beak was nearly entirely closed due to a stretched operculum, while the operculum on the concave side was foldedBack to article page