Falconiform Skulls 3 Gronvold - A drawing of different types of birds

Skulls of Falconiformes

Fig. 1. Lateral view of the upper jaw of Hierofaleo gyrfalco, showing the gradual
suppression of the vertical bullate portion of the maxillo-palatine by the
increasing development of the anterior olfactory chamber (vestibulum
externus).
Fig. 2. Lateral view of the upper jaw of Sarpa australis, showing the more
primitive condition of the vertical bullate portion of the maxillo-palatines
in the Falconinae.
Fig. 3. Lateral view of the upper jaw of Milvago chimachima, showing the more
primitive condition of the bullate portion of the maxillo-palatines in the
Polyborinae.
Fig. 4. Lateral view of the upper jaw of Herpetotheres cachinnans, showing the
maximum development of the bullate portion of the maxillo-palatines
reached by the Falconinae.
Fig. 5. Lateral view of the upper jaw of Ibycter ater, showing the maximum
development of the bullate portion of the maxillo-palatines reached by the
Falconhue.
Fig. 6. Dorsal aspect of the palatal bones of a young Pernis apivorus, to show
the hemipterygoids.
Fig, 7. Lateral view of the palatal bones of a young Pernis apivorus, to show the
relation of the hemipterygoid to the vomer.
Fig. 8. Lateral view of the lachrymo-nasal region of the skull of Psophia, after
removal of the lachrymal and part of nasal, to show the septo-maxillary
spurs and their relation to the maxillo-palatines and nasal septum.

h.pt. = hemipterygoid.
mx.p. = maxillo-palatine.
w.s. = nasal septum.
v.e. = vestibulum externus.
vo. = vomer.