The MGI Mouse Genome Informatics website states for the Mus musculus 129 strain, popular in biomedical research, that:
Origin: Dunn 1928 from crosses of coat colour stocks from English fanciers and a chinchilla stock from Castle.
However, according to wikipedia, Chinchillas are in the suborder Hystricomorpha, whereas the house mouse is in the Myomorpha suborder of the Rodentia order. From my limited knowledge about species hybridisation, this seems like quite the evolutionary distance for these species to hybridise. How plausible is it that the 129 mouse strain was actually bred through hybridisation efforts between chinchillas and house mice? I'm also open to the possibility that I might've misinterpreted some relevant information.