Multiple origins of melanism in two species of North American tree squirrel (Sciurus) McRobie, Helen R. ; Moncrief, Nancy D. ; Mundy, Nicholas I. Abstract Publication: BMC Ecology and Evolution Pub Date: December 2019 DOI: 10.1186/s12862-019-1471-7 Bibcode: 2019BMCEE..19..140M