Hyenas are amazing animals. It takes a single hyena less than two minutes to consume an entire Thompson's gazelle. A pack of 21 hyenas was able to polish off a 220 kg zebra and a 150 kg foal in about 30 minutes. An extinct species of borophagine dog (Borophagus) was probably able to accomplish similar feats as well. Borophagines, being descended from canids, retained post-carnassial molars. This pushed the carnassials forward in the jaw and they are located in the region of maximum bite force production and is what allowed them to crack bones efficiently using their carnassials (the carnassials are composed of a blade-like upper fourth premolar and a somewhat blade-like lower first molar). In hyenas, however, post-carnassial molars underwent a reduction and hyenas crack bones between their upper and lower third premolars not with the carnassials, which are behind the region of maximum bite.
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