Merck Manual

Please confirm that you are a health care professional

Open mouth, healthy chicken
Open mouth, healthy chicken

Open mouth of a healthy chicken. The opening in the middle is called a choana/pharyngeal slit and is a normal structure.

For an examination, open the mouth and check for ulcers and mucosal lesions on the tongue and mucosal membranes at the commissures of the beak.

Courtesy of Dr. Patricia Wakenell.