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Owerview of snakes using strangulation to kill prey
Jeřábková, Adriana ; Vrabec, Vladimír (advisor) ; Killerová, Šárka (referee)
Purpose of studies was collecting list of snakes - constrictors. There were suggested two hypothesis; 1st - killing prey using strangling is mostly widen by large snakes than smaller ones. 2nd; Mechanism going while grabing and following killing of prey were in different kinds of snakes constrictors generated convergently and are similar. From given list of kinds of snakes and figures telling their proportions it is obvious that strangling as form of killing is major by snakes over 1,5m, therefore first hypothesis I can confirm so. Also from table of expansion individual genuses using strangling it is apparent that this method killing is known in all continents where snakes lives and simultaneously with fylogeneticaly receded kinds of snakes. I can then with higher probability confirm also second assumed hypothesis, nevertheless, own grabing and killing strategy of prey is different in some details. Some kinds challenge prey from ground, possibly from water, some kinds attack prey from trees and bushes. Difference in rotation of body along prey warries by grass snakes and by boid snakes. Boids bend neck verticaly around prey, while many grass snakes bend body sideways around the prey. It was made many tests of measuring strenght and mechanism strangling by various methods, e.g. Magnetic Resonance, Autopsy etc., however these experiments cannot be classified to this work for reasons of great amount given experiments and great amount of outcomes.
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