Fig. 3. Summary of behavioural responses to the trial stimulus; responses are summed over three trials, each of eight specimens. (A) Incidence of body movement (black) defined as number of seconds (out of 10) during which the snake was in motion during the three periods and tongue flicks (stippled). Note that the `freeze' response produced a significant decline in movement during the trial period, and the significant decrease in tongue flicks. For an explanation, see text. (B) Incidence of head jerks (black) and rattling (stippled), note that both behaviours were only observed during the trial period leading to significant responses for both.

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