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Leach’s Storm-petrel Oceanodroma leucorhoa L 16-18cm. More robust and longer-winged than British Storm-petrel; flight is ever-changing flight with powerful wingbeats and glides. Sexes are similar. Adult is dark sooty-grey except for pale panel on upperwing coverts. Fork in tail and grey central line on rump can be hard. Underwings are all-dark. Juvenile is similar to adult. Voice Silent at sea; weird gurgling rattles are heard when nesting. Status Truly oceanic. Very locally common but hard to see. Only willingly comes close to land after dark, at breeding colonies.