The deaths come two weeks after about 200 pilot whales died in Australia after stranding themselves on a remote Tasmanian beach.
“These events are tough, challenging situations,” the Department of Conservation wrote in a Facebook post. “Although they are natural occurrences, they are still sad and difficult for those helping.”
“We do not actively refloat whales on the Chatham Islands due to the risk of shark attack to humans and the whales themselves, so euthanasia was the kindest option,” said Dave Lundquist, a technical marine advisor for the conservation department. Mass strandings of pilot whales are reasonably common in New Zealand, especially during the summer months. Scientists don’t know exactly what causes the whales to strand, although it appears their location systems can get confused by gently sloping sandy beaches.
“They rely on their echolocation and yet it doesn’t tell them that they are running out of water,” Grover said. “They come closer and closer to shore and become disoriented. The tide can then drop from below them and before they know it, they’re stranded on the beach.”
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