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discriminate between tastes and exhibit associative learning. The one-day-old hatchlings ate 2nd instar silk-moth larvae (prey) placed in non-painted, orange or green dishes without any bias for the background colour. They ate sucrose coated sweetened prey, but given a choice preferred natural larvae. But they

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PREFERENCE OF PREY SIZE AND PROFITABILITY IN BARN OWLS TYTO ALBA GUTTATA by ROTTRAUT ILLE1) (Department of Zoology, University of Vienna, 1090 Wien, Althanstr. 14, Austria) (With 4 Figures) (Acc. 01-VIII-1990) Introduction The decision which prey a predator should select, if alternatives are

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References Abrams PA. 2000 . The evolution of predator-prey interactions: theory and evidence . Ann Rev Ecol Syst. 31 : 79 – 105 . Ale SB , Brown JS . 2007 . The contingencies of group size and vigilance . Evol Ecol Res. 9 : 1263 – 1276 . Bakker RT. 1983 . The