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Although typically very quiet, rabbits do communicate vocally, with varying types of vocalisations communicating different messages, e.g. low humming when running around an individual is a signal of affection.
Rabbits stand upright on their hind legs to give themselves a better vantage point to look for predators. They alert other rabbits to the presence of danger by thumping their hind legs.
The scientific name for rabbits is "Leporidae", meaning: those that resemble hares.