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Some prehistoric bears had really big mandibles. Here i would like to point out a huge mandible concerning Arctotherium Angustidens which is 395mm in length (specimen BMNH32916, first column of the Table)!
Source: First Record of Arctotherium (Ursidae, Tremarctinae) in Northwestern Argentina and its Paleobiogeographic Significance - 2008.
According to you, what would be the length of the skull of this specimen? I don't know the ratio between skulls and mandibles in bears.
But there is more surprising: look at the specimen MACN 851 in the second column. The length of the mandible is not specified but all others measurements seems larger than the one previously cited. So correct me if i am wrong but maybe we have a mandible of Arctotherium around 400mm???