| Dorsal surface of tongue |
Birds |
authors |
| Median groove |
Golden eagle, white tailed eagle, ducks and geese |
Komarek[11], Vollmerhaus and Sinowatz[10],Parchami[14]and Jackowiak and Godynicki[7]. |
| Median crest |
cormorant |
Jackowiak et al. [15] |
| No marked structure |
Most birds |
Kobayashiet al. [6], McLelland[30], Grant and Temeles[35] and Emura[26]. |
|
