Uno de los grupos de vertebrados mas vulnerables en la naturaleza. En Tamaulipas alcanzan una diversidad importante por la privilegiada ubicación geográfica en la transición de las zonas neartica y neotropical.
17. (c) Nicholas Pederson, some rights reserved (CC BY-NC-SA)
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19. (c) Opuntia Cadereytensis, some rights reserved (CC BY-NC), uploaded by Opuntia Cadereytensis
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22. (c) Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Amphibians & Reptiles, some rights reserved (CC BY-NC-SA)
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