The pre-historic creatures suffered incredible evolutionary pressures. While the meteor strike was undoubtably significant, other weaknesses challenged them every step of the way. Early creatures were highly vulnerable when they ate, as well as when they went to the bathroom. The early dinosaur bird, The terodactyls was extremely vulnerable to Darwinian selection pressures when the bird urinated due to the high pitched urine noise. Evolutionary pressure resulted in the development of silent urination of the pterodactyls, hence the name change and the silent “p”.
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