Crocodiles are mainly nocturnal hunters and scavengers. They raise their body temperatures by hauling themselves out of the water and basking in the sun, usually both morning and evening. Crocodiles often appear torpid while they are in fact in a state of readiness to either flee or attack. Crocodiles are variably vocal. Adult males may bellow to establish dominance. All size classes will growl and hiss when intimidated. Hatch-lings grunt to each other and will squawk loudly if caught. There is evidence that they also communicate via ultrasound.

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