Natural history, demography, and home range characteristics of a southern California population of Phrynosoma mcallii inhabiting atypical habitat

Phrynosoma mcallii inhabiting a topographically complex, sparsely vegetated, "mudhill" terrain site in southern California in 1999 and 2000 had low mortality rates, and small clutch sizes compared to previous data from this species. Females likely produced a single clutch of eggs in each year. Although this population occurs near a heavily used OHV trail, I did not detect any mortality due to OHV use.;Lizards did not center home ranges on obvious habitat features. Lizards maintained smaller home ranges and exhibited greater range fidelity than did lizards at other sites in other years. Phrynosoma mcallii share many area-use characters with other phrynosomatid lizards; males maintain home ranges approximately twice as large as females, and lizards maintain home ranges which overlap home ranges of lizards of the opposite sex more than home ranges of lizards of the same sex.