![]() ![]() ![]() They believe that the snakes’ technique is why they are such efficient killers. “Our results suggest that boas are subduing and killing their prey during constriction by significantly affecting the prey’s cardiovascular system,” the researchers write in the Journal of Experimental Biology. What is more, there were changes to the rats’ blood chemistry during the process with potassium levels nearly doubling and the pH dropped from 7.4 to 7.0. Within six seconds of being constricted, peripheral arterial blood pressure at the femoral artery dropped to a half of baseline values.Ĭentral venous pressure (CVP), meanwhile, increased 600% from baseline during the same time.Įlectrocardiographic recordings from the rat’s heart showed the heart rate plunged to nearly half of baseline within a minute of the snake starting to squeeze the life out of its victim.īy the end of the process the rat’s PBP had fallen nearly 300% and nearly all the rats showed cardiac electrical dysfunction. The results show that the process, whereby the boas immobilise and kill their prey, is as rapid as it is deadly. The researchers measured the cardiovascular function of (heavily anaesthetised) rats before, during and after being constricted by the snakes to determine the effect of constriction on the prey’s circulatory function. Scientists have finally worked out why snakes, such as boa constrictors, are so deadly in a somewhat macabre experiment using rats. ![]()
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