Figure 2. Photograph showing the floor of the oropharynx in the Muscovy duck. Note the tip of the tongue (T), body of the tongue (B), lamellae of the bill (L), lingual prominence (LP), mucosal swellings (S), median ridge (R), glottis (GL), median lingual sulcus (Black arrowhead), conical papillae on the caudal border of the lingual prominence (Red arrowheads), small conical papillae (Blue arrowhead), and large conical papillae (White arrowhead).