Abstract
Pacific shore crabs, Hemigrapsus nudus and Hemigrapsus oregonensis, were observed in a transparent Plexiglas maze as they escaped to a rock shelter. Measures were made of escape latency and number of zone crosses. H nudus displayed a faster escape than H. oregonensis but was not significantly more active. The results were interpreted as of adaptive significance for H. nudus in the general occupation of a more exposed shoreline habitat than that of H. oregonensis.
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