Weapons are of three kinds - those that are used by predators to attack their prey, weapons of defence including armour (Sect. 10.6.4), and agonistic weapons used in intraspecific sexual rivalry. These functions, however, can often be interchangeable; weapons of attack are also employed by carnivores in defensive situations when they are attacked by enemies larger or more formidable than themselves. They may also be used in agonistic combat (Sect. 9.3.1). Again, weapons whose primary function is agonistic may well be used in defence against predators, and so on. The scales of dinosaurs, like those of croco-dilians, were embedded and sunk into the thick, protective skin.
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