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The survival rates of Indo Pacific bottlenose dolphins like this one were reduced following a marine heat wave in Australia. Graeme Snow

Climate change could have a deadly impact on dolphins and other marine mammals.

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A record number of dolphins have washed up dead and mutilated on French beaches, and scientists don't know exactly why.

Activists say 1,100 dolphins have washed up on France's Atlantic coast since January, but the number could be as much as 10 times higher than that, as many likely sink instead of washing ashore. Researchers at the La Rochelle marine laboratory Observatoire Pelagis said they had seen "extreme levels of mutilation" on the dolphins that did wash up, The Guardian reported.

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Five Common dolphins like this have washed up on beaches in Southern California this February. Fat Tony / Aurora Photos / Getty Images

A surprising number of dolphins are washing up on Southern California beaches this February, and the Pacific Marine Mammal Center (PMMC) wants to know why.

The PMCC has responded to six beached dolphins in just 14 days, it said in a Monday press release. By this time last year, it had only responded to one stranding.

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Two baby Loggerhead turtles. U.S. Air Force / Senior Airman Veronica McMahon

Florida's longest red tide in more than a decade has killed scores of the state's most iconic marine animals.

The current outbreak, which began in October 2017 off southwest Florida, has been tied to a record 589 sea turtle deaths and 213 manatee deaths, the Herald-Tribune reported, citing figures from the Florida Fish and Wildlife Conservation Commission.

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A rescue boat races to the scene of an oil tanker fire off the Hong Kong coast Tuesday. Hong Shaokui / China News Service / VCG via Getty Images

An oil tanker caught fire off of Hong Kong's Lamma Island Tuesday morning, leaving one person dead and two missing.

"We could see that the victim who passed away had been burned," police representative Wong Wai-hang said in a briefing reported by The New York Times. "There were clear injuries on his head and fractures in his hands and feet."

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Dolphin found with a bullet wound in California's Manhattan Beach. Marine Animal Rescue / Facebook

How could anyone shoot a dolphin? A dolphin that washed up dead in Manhattan Beach, California died from a bullet wound, according to local animal rescue workers.

Earlier this month, Peter Wallerstein, the founder of Marine Animal Rescue, responded to a call about a stranded dolphin on the surf, according to NBC News. By the time he arrived at the scene, the marine mammal was dead.

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Otsuchi, in northern Japan, is the focal point of the hand harpoon hunt which has claimed up to 15,000 Dall's porpoises in previous years.

In the most recent hunting seasons for which information is available, Japan allocated itself a quota of 13,493 Dall's porpoises in 2013/14, 12,928 in 2014/15 and 12,364 in 2015/16. The catch, however, has been significantly less than the quota for many years. In 2016, just over a thousand porpoises were killed.

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A rare hybrid between a melon-headed whale and a rough-toothed dolphin (pictured) was discovered off the coast of Kauai. NOAA

Researchers have spotted the first ever hybrid between a melon-headed whale and a rough-toothed dolphin off the coast of Kauai, Hawaii, CNN reported Tuesday.

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Debra McGuire / Getty Images

Monday the National Marine Fisheries Service designated 17,500 square miles of ocean as protected critical habitat for Hawaii's false killer whales, a dolphin species whose numbers have dwindled to around 150 in the wild.

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Tucuxi Amazon river dolphins (Sotalia fluviatilis). Projeto Boto

By Claire Asher

Populations of two species of river dolphin in the Amazon are halving every decade, according to the results of a twenty-two year survey.

The Amazon rainforest is home to the Amazon river dolphin, or Boto (Inia geoffrensis) and the Tucuxi (Sotalia fluviatilis). But the results of a long-term study published in PLoS ONE show that both of these once abundant aquatic mammals are now in rapid decline in the Brazilian Amazon, likely due to hunting and fishing.

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A pipeline running from the Chinese Golden Lead factory into the ocean. Stop Golden Lead Factory Exploiting The Gambia / Facebook

A dolphin was found dead on a beach in Gungur, a coastal town in The Gambia, aggravating local concerns over pollution being dumped into the ocean by a Chinese fish processing factory, Africa News reported Sunday.

Heartbreaking photos of the incident were tweeted out by Togo human rights advocate Farida Nabourema Saturday.

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