About David Nagorsen David Nagorsen is a biological consultant based in Victoria; he has written three handbooks published in the Mammals of BC series: Bats of BC (with R.M. Brigham), Opossums, Shrews & Moles of BC and Rodents & Lagomorphs of BC. Books by David Nagorsen Bats of British Columbia by (author) Cori Lausen, David Nagorsen & Mark Brigham Rodents and Lagomorphs of British Columbia by (author) David Nagorsen