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Colorado Division of Wildlife currently considers the Texas horned lizard a species of special concern. From May 1995 to October 1997, Texas horned lizards were captured or collected during the active season from 6 counties in Colorado to document abundance and distribution of the species. We captured or collected 290 Texas horned lizards (170 alive and 120 dead on road). In Colorado, average snoutvent length (SVL) for adult males was not significantly different from females; the largest male and female lizards measured 84.9 mm SVL and 90.4 mm SVL, respectively. The sex ratio of adult males to adult females is 1M:1.4F. Results of distribution and habitat analysis indicated that the Texas horned lizard in Colorado is locally common in arid shortgrass and sand-sage prairie lacking ground litter. Activity of the Texas horned lizard in Colorado is diurnal in spring and fall and bimodal (almost crepuscular) in the summer. Texas horned lizards in Colorado apparently breed in May and June, and hatchlings emerge in late August to mid-September. Mortality due to vehicle traffic seems high, but because the Texas horned lizard occurs in remote areas, the Colorado population in general seems to be relatively stable. La división de vida silvestre del estado de Colorado denomina el lagarto Phrynosoma cornutum como una de las especies en riesgo en el estado. De mayo de 1995 a octubre de 1997, se documentaron capturas y colectas del lagarto P. cornutumdurante la época de actividad para determinar su abundancia y distribución en seis condados del estado de Colorado. Capturamos o colectamos 290 lagartos (170 vivos y 120 muertos en la carretera). En Colorado, el promedio longitudinal hocicocloaca (LHC) para adultos macho no fue significativamente diferente que el de las hembras; el macho y la hembra más largos midieron 84.9 mm LHC y 90.4 mm LHC, respectivamente. La proporción de machos y hembras adultos fue de 1M:1.4H. Los resultados de la distribución y el análisis de hábitat indican que el lagarto P. cornutum en Colorado habita praderas áridas de grama corta y de mata Artemisia que carecen de hojarasca. En Colorado, la actividad del lagarto P. cornutum es diurna durante la primavera y el otoño y bimodal (casi crepuscular) durante el verano. El lagarto aparentemente se aparea en mayo y en junio y sus crías emergen desde fines de agosto hasta mediados de septiembre. La mortandad debido al tráfico vehicular parece alta, pero dada la abundancia del lagarto en áreas remotas, la población de lagartos P. cornutum en Colorado parece ser relativamente estable.

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Q: History of the Texas horned lizard?
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