Maximum jaw gape is a performance variable related to feeding and non-feeding oral
behaviors, such as canine gape displays, and is influenced by several factors including jaw-
muscle fiber architecture, muscle position on the skull, and jaw morphology. Maximum gape,
jaw length, and canine height are strongly correlated across catarrhine primates, but
relationships between gape and other aspects of masticatory apparatus morphology are
less clear. We examine the effects of jaw-adductor fiber architecture, jaw-muscle leverage …