as the comparison illustrates, the bottom edge of the lower jawbone of the lion skull is prominently convex while that of the tiger skull looks straight or slightly concave. although there are certainly some exceptions, this unmistakable attribute is often used as a rule of thumb to distinguish between lion and tiger skulls. image of cape lion skull adapted from http://www.geller-grimm.de/museum/imag/mus134.jpg image of siberian tiger skull adapted from http://www.skullsunlimited.com/userfiles/image/variants_large_4123.jpg
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