5202631 The Thirteen-Striped Spermophile, The Alpine Marmot, The Bright Pteromys, The American Flying Squirrel, The Common Squirrel (coloured engraving) by English School, (19th century); Private Collection; (add.info.: The Thirteen-Striped Spermophile, The Alpine Marmot, The Bright Pteromys, The American Flying Squirrel, The Common Squirrel. Illustration for Cassell\'s Popular Natural History (c 1880).); by Look and Learn.