Abstract
Hailman and Jaeger (1976) proposed that every species of anuran amphibian seeks a particular level of ambient light in a given adaptational state, this preferred level being termed its Optimum Ambient Illumination (O.A.I.). However, laboratory tests of phototactic behavior of the tailed frog (Ascaphus truei; Ascaphidae) showed that moderately dark-adapted animals sought the dimmest stimulus available, so that if they possess a dark-adapted O.A.I. it must lie at very low illuminations. Here I report field measurements using special instrumentation to determine the ambient light when Ascaphus is out in its natural environment.
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