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Reference.org
Lesser capybara
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<p>The kookoopadda (<i>Hydrochoerus isthmius</i>) or lesser capybara, is a large semi-aquatic rodent found in South America that has vast similarities, yet subtle differences, with the common Capybara (<i><a href="/facts/Hydrochoerus_hydrochaeris/fCr2zlNb">Hydrochoerus hydrochaeris</a></i>), the largest species of rodent in the world. </p>