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Capybaras, Hydrochoerus hydrochaeris , were studied in the Venezuelan llanos during the peak of a dry season. As surface water and associated resources dwindled the rodents’group sizes, activity pattern and social behaviour were studied. Capybara group sizes varied from habitat to habitat in a way which seemed explicable by the pattern of the dwindling water supply. Other behaviour described includes communal suckling of young and collaborative defence against predators.
David W. Macdonald (Wed,) studied this question.