Crocodilians communicate with each other with sounds that they make by forcing air through a voice box in the throat. The young call to the adults when they are in danger and make lots of noise while they are being fed. Adults make loud, low roars to each other. If they are threatened, adult crocodiles hiss and growl. When a male and a female meet, they purr softly.
They also use poses and movements to communicate. Raising the jaw off the ground is one such movement.
Sydenham & Thomas, Australian Crocodiles
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