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Updated: Feb 9, 2026

Testing Visual Sensitivity to the Speed and Direction of Motion in Lizards
Published on: December 14, 2006
Hematology of Free-ranging and Managed Texas Horned Lizards ( Phrynosoma cornutum)
Michael S McEntire1, Ashley Pich2, Martin Zordan3
11 College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, 660 Raymond Stotzer Parkway, College Station, Texas 77843, USA.
Abstract:
The Texas horned lizard ( Phrynosoma cornutum) is a threatened species in Texas, US (federal category C2). Causes for population declines in this species are likely multiple. Disease and health assessments using traditional methods, including hematology, have been minimally studied in Phrynosoma spp. Apparently healthy, free-ranging Texas horned lizard from four locations in Texas ( n=53) and captive Texas horned lizards maintained at the Fort Worth Zoo ( n=16) were sampled to establish hematologic reference intervals. Within the populations studied, total leukocyte, heterophil, and eosinophil counts were higher in managed compared to free-ranging lizards. Leukocyte and heterophil counts of all lizards were lower during the ovipositional months of June and July.
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