Abstract
Abstract 1. Deep body temperatures of three Gopherus berlandieri were monitored with radio-telemetry in their natural habitat, in June 1974. 2. In contrast to G. agassizii, this species engages in extensive pre-emergent basking. It does not emerge until its body temperatures have reached minimal voluntary limits. 3. Activity was notably curtailed, indicating summer aestivation. 4. Aestivating tortoises maintained lower average body temperatures than active individuals. 5. Pre-emergent basking allows this species to attain full co-ordination of its functions before exposing itself. This factor allows it to actively escape to shelter when disturbed rather than to depend upon passive resistance.
Published Version
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