Abert's squirrel from Report of an Expedition Down the Zuni and Colorado Rivers (1853) published by Lorenzo Sitgreaves.… https://www.rawpixel.com/image/562382/squirrel-shade-drawingFree Image from public domain licenseDrawing of Abert's squirrel https://www.rawpixel.com/image/562451/squirrel-shade-drawingView licensePNG Drawing of Abert's squirrel, transparent background https://www.rawpixel.com/image/562302/png-drawing-aberts-squirrel-transparent-backgroundView licenseDrawing of Abert's squirrel https://www.rawpixel.com/image/562370/squirrel-shade-drawingView license