From the 20-foot-long jawbones of the filter-feeding blue whale to the short, but bone-crushing, jaws of the hyena and the delicate chin bones of a human, the pair of lower jawbones characteristic of ...

A tight jaw can happen for many reasons, such as stress, temporomandibular joint disorders, grinding the teeth at night, and tetanus, among others. Share on Pinterest Nes/Getty Images Jaw tightness ...

A random selection of lower jaw shapes from among the world's vertebrate animals. All are mammal jaws consisting of a single bone except for those in orange, which are from vertebrates that have lower ...