This is cool. A fossil otter from China (Siamogale melilutra), from about six million years ago, is estimated to have weighed 50kg, have been the size of a wolf, and had a jaw with equivalent crushing power to that of a bear.
Popular article here: Extinct wolf-sized otter had powerful bite
The scientific paper describing the jaw strength is here: Feeding capability in the extinct giant <i>Siamogale melilutra</i> and comparative mandibular biomechanics of living Lutrinae
The abstract of the original description of it as a new species is here (2017): http://www.tandfonline.com/doi/full/10.1080/14772019.2016.1267666
Popular article here: Extinct wolf-sized otter had powerful bite
The scientific paper describing the jaw strength is here: Feeding capability in the extinct giant <i>Siamogale melilutra</i> and comparative mandibular biomechanics of living Lutrinae
The abstract of the original description of it as a new species is here (2017): http://www.tandfonline.com/doi/full/10.1080/14772019.2016.1267666