People say "When pigs fly" to describe the impossible. But even if most mammals are landlubbers, the ability to glide or fly has evolved again and again during mammalian evolution, in species ranging ...
Introduction -- Gliding marsupials -- Colugos -- Flying squirrels -- Scaly-tailed flying squirrels -- Appendix 1. Subspecies -- Appendix 2. Gliding mammal localities -- Appendix 3. IUCN red list ...
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