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We present a review and analysis of the conservation status and International Union for Conservation of Nature (IUCN) threat categories of all 360 currently recognized species of extant and recently extinct turtles and tortoises (Order Testudines). Our analysis is based on the 2018 IUCN Red List status of 251 listed species, augmented by provisional Red List assessments by the IUCN Tortoise and Freshwater Turtle Specialist Group (TFTSG) of 109 currently unlisted species of tortoises and freshwater turtles, as well as re-assessments of several outdated IUCN Red List assessments. Of all recognized species of turtles and tortoises, this combined analysis indicates that 20.0% are Critically Endangered (CR), 35.3% are Critically Endangered or Endangered (CR+EN), and 51.9% are Threatened (CR+EN+Vulnerable). Adjusting for the potential threat levels of Data Deficient (DD) species indicates that 56.3% of all data-sufficient species are Threatened. We calculated percentages of imperiled species and modifi...

We described seasonal microhabitats of the lizards Uta stansburiana, Phrynosoma modestum, and Aspidoscelis tigris in the sand dunes of Medanos de Samalayuca, Chihuahua, Mexico. Uta stansburiana and A. tigris used many resources in common and frequently were observed under honey mesquites Prosopis glandulosa, the most common and largest shrub on our study site. In contrast, P. modestum was more common in bare areas. Uta stansburiana and A. tigris showed moderate to high overlap in vegetative cover and compaction of substrate. With respect to Uta stansburiana and A. tigris, P. modestum showed low-to-moderate overlap in microhabitats.