A quick guide to distinguishing between the crania of tigers (i–iii) (AZ1065, AZ772, Ia157) and lions (iv–vi) (TM24004, AZ771, AZ566) using the alignment of the posterior projections of the nasal-frontal and maxilla-frontal sutures.

<p>Specimens (i) and (iv) are male, specimens (ii) and (v) are female, whereas specimens (iii) and (vi) are of unknown (?) sex. The cranial sutures have been outlined to show the alignment, and are aligned in lions but not in tigers. Three additional features can also be used with less certainty (indicated by letters a,b,c in i and iv above), namely (a) the angle of the apex of the maxilla-frontal suture, (b) the length of the gap between the premaxillar and the nasals, and (c) the distance between the foramen and the nasals.