Abstract
Young rat snakes (Elaphe) were deprived of water for 6 days and then tested by placing a dry cotton swab and a swab dipped in distilled water 1 cm in front of the snake’s snout. Two measures, approach/tongue flick and approach orientation, revealed that the water elicited higher responding than the dry stimulus. The Ss were then tested over a 10-day period. The stimulating effectiveness of water under deprivation was found to decline at first and then increase until ad lib water was returned. It was concluded that water is an effective stimulus for the snake’s chemoreceptors but would elicit responding only under conditions of deprivation.
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