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Female Magellanic penguins are becoming stranded after moving further north to beat competition from rival males to find food, experts say.
Water and noise pollution, as well as fishing, are forcing the species to further afield, up to 620 miles (1,000km) away from their breeding grounds.
Year - Thousands - Penguins - Coast - Females
Each year, thousands of penguins are stranded along the South American coast, with females to accounting for 75 per cent of those that get lost.
Researchers were puzzled why this was the case, but tracking 14 penguins revealed that females venture further north.
Scientists - Institute - Statistical - Mathematics - Tokyo
Scientists from the Institute of Statistical Mathematics in Tokyo used GPS trackers to monitor eight males and six females in 2017.
The penguins finished breeding in Patagonia in late February, after which they began their migration in search of food.
Females - Areas - Males - Waters - Coast
Females reached more northern areas than males, who stuck to waters off the Argentinian coast.
The researchers said that these behavioural differences between sexes in winter could be related to competition for food resources or factors related to differences in size.
Males - Females - Penguins - North - Risk
Males are larger and heavier than females. They also suggest penguins travelling further north may be at greater risk to a wide range of threats - leading them to become stranded more often.
But the greater loss of females from the breeding population could have...
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