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However, with practice, these deafferented frogs exhibit gradual changes in both overall prey-capture strategies as well as changes in more subtle aspects of prey-capture kinematics, as their prey-capture success improves (unpublished data). Like the majority of published studies on feeding behavior, the previous examples investigate how frogs analyze and respond to individual prey features, such as size (Rana) or position (Dyscophus). In the final example, we explore how frogs respond to a wider variety of prey types that differ simultaneously in size, shape, velocity, and other attributes. To investigate this question, Valdez and Nishikawa ('97) presented frogs (C. novaehollandiae) with five prey types, including termites, crickets, waxworms, earthworms, and newborn Alectinib mice (Fig. 7). A statistical approach, including analysis of covariance, discriminant function analysis, and correlations among kinematic variables and prey characteristics, was used to investigate how prey-capture strategies differed among these diverse prey. Prey-capture sequences were digitized and each sequence was characterized in terms of 19 kinematic variables that included the duration, distance, and velocity of prey-capture movements (e.g. mouth opening, tongue protraction, etc.). Twelve check details of the 19 kinematic variables were observed to differ among prey types, after accounting for the large number of statistical tests (Valdez and Nishikawa, '97). A discriminant function analysis demonstrated that prey type was discriminated accurately on the basis of frog movements GPX4 for 119 of 126 trials (94.4%, Wilks�� Lambda = 0.0167, P uses to capture diverse prey appear to be related to biomechanical trade-offs. The frogs exhibited kinematic strategies in which large prey were apprehended slowly but swallowed rapidly and small prey were apprehended rapidly but swallowed slowly (Fig. 8). These different strategies may reduce the probability of escape for both large and small prey. For large prey, Cyclorana directed its jaws upward when the aspect ratio was large and directed its jaws downward when the aspect ratio was small. Valdez and Nishikawa ('97) found evidence that, in Cyclorana, the choice among prey-capture strategies is organized hierarchically. In Cyclorana, the earliest decision relates to prey size (Fig. 8). Like Rana, Cyclorana used tongue prehension to capture small prey (waxworms, crickets, and termites) and jaw prehension to capture large prey (earthworms and mice).
