One general feature of the adult bird's skull is the almost complete disappearance of the sutures between the bones of the cranium proper, whilst another is the great movability of the whole palatal and other suspensorial apparatus.
Polyodontophis of Colubrinae), the movability being enhanced by the absence of the coronoid.
This is abruptly bent down in the middle, as if broken; the upper jaw is rather flat and narrow, while the lower jaw is very roomy and furnished with numerous lamellae, which, together with the thick and - ? :; =?:??.: large tongue, act like a sieve, an arrangement enhanced by the considerable movability of the upper jaw.