Female penguins 'get stranded more because they travel further'

Longer journeys may exhaust birds, say scientists tracking them off South American coast

Every year, thousands of Magellanic penguins get stranded along the coast of South America - but puzzlingly, about 75% of those that get stuck are female. Now scientists say they have worked out what is behind the gender imbalance: the females migrate further north than males.

Magellanic penguins finish breeding in Patagonia in February, and during the subsequent winter months head north, reaching as far as Brazil, in search of anchovies. But every year thousands become stranded, with many airlifted to safety onboard military aircraft.