In many extant reptiles, defensive behaviour is frequently associated with threat and display. However well armed an animal may be, it is always more economical in energy to drive potential enemies away by threatening them rather than by actually indulging in combat. The same must undoubtedly have been the case with the dinosaurs and other Mesozoic reptiles. It is not difficult to imagine the loud hisses and deep roars that would have been emitted by the enormous reptiles of the Mesozoic Era. In addition to warning or aposematic sounds, the display of defensive and offensive weapons would have been enhanced if adorned with brilliant warning colours. Blacks, yellows and reds, in particular, are always extremely conspicuous and would doubtless often have been naturally selected for aposematic purposes in the past, as they are today (Sect. 1.4).
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