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The bird was alternatively offered one specimen of a mealworm and one specimen of a firebug; each bird was thus successively presented with 5 mealworms and 5 firebugs. Because of limited numbers of tested birds especially in case of crested tits we have decided to take into account all marginally significant results to avoid a large type II error. The proportion of birds that killed the nonaposematic firebugs was low both in the blue tits and coal tits LSD test, NS. Body size, prey handling efficiency and choice of diet in three coniferous forest tits Paridae. With the only one exception, blue tits handled the prey carefully and did not kill any nonaposematic firebugs. Pseudopodoces humilis , a misclassified terrestrial tit Paridae of the Tibetan Plateau: evolutionary consequences of shifting adaptive zones. Small proportion of individuals in other tit species crested tit, coal tit, willow tit, and great tit killed the firebugs during the handling Table 1 , Figure 2A. Importance of colour in the reaction of passerine predators to aposematic prey: an experiment with mutants of Pyrrhocoris apterus Heteroptera. Select Format Select format.

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