Sarcopterygiilobe-finned fishes and terrestrial vertebrates


    • Lesser Siren
      Siren intermedia
    • Lesser Siren
      Siren intermedia
    • Siren lacertina
    • Massasauga
      Sistrurus catenatus
    • Massasauga
      Sistrurus catenatus
    • Massasauga
      Sistrurus catenatus
    • Massasauga
      Sistrurus catenatus
    • Massasauga
      Sistrurus catenatus
    • Massasauga
      Sistrurus catenatus
    • Massasauga
      Sistrurus catenatus
    • Massasauga
      Sistrurus catenatus
    • Massasauga
      Sistrurus catenatus
    • Massasauga
      Sistrurus catenatus
    • Pigmy Rattlesnake
      Sistrurus miliarius
    • red-breasted nuthatch
      Sitta canadensis