The skull is longer and more narrow than that of a domestic cat. When compared to the leopard cat's skull, the Iriomote cat's is roughly the same size but thicker. Because of this, the Iriomote cat's brain is smaller; a male leopard cat's brain is about 42 grams, whereas a male Iriomote cat's brain is about 30 grams. The occipital bone of the skull and the auditory capsule are not connected. The mandibular symphysis is short.
