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Whales in mass stranding on Western Australia beach

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About 75 whales have already died, Western Australia authorities say
About 150 whales have become stranded on a beach in Australia, prompting a major rescue effort.The animals were spotted by a fisherman at Hamelin Bay, about 300km (180 miles) south of Perth, early on Friday.About half of the whales were already dead, according to authorities in Western Australian (WA).Conservation officials said they were trying to save the surviving animals on the beach."The strength of the animals and the windy and possibly wet weather conditions will affect when and where we attempt to move them out to sea," said Jeremy Chick, from the Department of Biodiversity, Conservation and Attractions.
Officials said the animals were thought to be short-finned pilot whales, a species known to strand "en masse".
It is not known why the whales became stranded
The Australian Broadcasting Corporation reported that dozens of rescuers were at the beach.Authorities have also issued a shark alert, warning people to stay away from the area."It is possible the dead and dying animals will act as an attractant, which could lead to sharks coming close into shore along this stretch of coast," the state's fisheries department said in a statement.Short-finned pilot whales usually measure up to 5m (16ft) and are found in tropical and sub-tropical waters, according to officials.Scientists do not know exactly what causes whales to beach themselves.
Experts have said stranding can occur when whales are sick, injured, or make navigational errors, particularly along gentle sloping beaches.
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Sometimes beached animals can send out distress signals that attract other whales to become stranded.In 1996, about 320 long-finned whales became beached in Western Australia's largest stranding.
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