Nearly twice as many emperor penguins inhabit Antarctica as was thought.
UK, US and Australian scientists used satellite technology to trace and count the iconic birds, finding them to number almost 600,000.
Their census technique relies in the first instance on locating individual colonies, which is done by looking for big brown patches of guano (penguin poo) on the white ice.
High resolution imagery is then used to work out the number of birds present.
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