Field book of North American mammals New York,G. P. Putnam's Sons,1928. biodiversitylibrary.org/page/9991584  A new species of #rat discovered & it's nearly toothless! news.discovery.com/animals/new-rat-species-is-nearly-toot... See a few of the ~2300 rat sp. in #bhlib biodiversitylibrary.org/page/9991584