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In page Wombat:

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Wombats are generally quiet animals. Bare-nosed wombats can make a number of different sounds, more than the Hairy-nosed wombats. Wombats tend to be more vocal during mating season. When angered, they can make hissing sounds. Their call sounds somewhat like a pig's squeal. They can also make grunting noises, a low growl, a hoarse cough, and a clicking noise.[citation needed]