This is the skull of an extant crocodile, though a different specimen from that seen in Chapter 1.

Identify as many of the openings in the skull as you can. Note the absence of the antorbital fenestra. Note the complex sculpturing of the external dermal bone surfaces.

Look at the simple tooth shape and note how the upper and lower sets of teeth interdigitate.

Examine the bony secondary palate and consider which bones are involved in its formation. Locate the internal nares and work out where the nasal passages must run in order to link internal and external nares. Where would the major jaw closing and opening muscles be located?

Note that the snout is relatively broad and flat and compare its general shape with that seen in Tomistoma later in this practical. Note how the jaw margin undulates along its length – why would this be a useful adaptation?