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Dietary preferences of selected snake species
 STARÁ, Zuzana
In this study I investigated the dietary preferences of very familiar snake in our country - grass snake (Natrix natrix). I did the experiments with both adults and young individuals. I used Y-maze apparatus for testing. I selected frog (Rana esculenta) and fish of two sizes (Cyprinus carpio) as a prey items for those experiment. I tested snakes in three experimental settings. In the first the prticular snake can choose between empty branch and small fish at the end of the second branch, in the second two fish of different size were offered, and the third experimental setting investigated the preference between small fish and frog. As a prey I used only the cotton rubbed against the prey item (carp or frog) which I subsequently placed to the plastic box at the end of two branches of Y-maze. The results show that the adult snakes are less choosy in their diet than the young snakes which almost always prefer frog prey against fish.
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