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A sand tiger shark swims over the USS Tarpon in Monitor National Marine Sanctuary. Tane Casserley / NOAA

By John R. Platt

Here at The Revelator, we love a good shark story.

The problem is, there aren't all that many good shark stories. According to recent research, sharks and their relatives represent one of the world's most imperiled groups of species. Of the more than 1,250 known species of sharks, skates, rays and chimeras — collectively known as chondrichthyan fishes — at least a quarter are threatened with extinction.

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The Wildlife from Space project uses satellite technology to identify, count and monitor species such as emperor penguins in Antarctica. British Antarctic Survey / YouTube

New satellite images have revealed 11 new throngs of emperor penguin colonies, lifting the number of known emperor penguin colonies by 20 percent and their total population by 5 to 10 percent, according to The Guardian.

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Whooping cranes fly in Wheeler National Wildlife Refuge in Decatur, Alabama. There were only 48 whooping cranes in the country when the Endangered Species Act was passed in 1973, and thanks to the law's protections there are now over 600. U.S. Fish and Wildlife Service / Flickr / CC BY 2.0

By Eoin Higgins

Environmental groups on Friday condemned the announcement of a new rule proposed by President Donald Trump that would further weaken the Endangered Species Act by making it easier to destroy habitats vulnerable species rely on for survival.

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A Malayan porcupine photographed at Kaeng Krachan National Park, Phetchaburi, Thailand. Jason Thompson / CC BY 2.0

By John R. Platt

A porcupine's diet is wide, varied, and a little hard to digest. A lifetime of grasses, herbs, bark and other vegetation can leave little bits of indigestible matter behind in a porcupine's digestive tract, where they occasionally congeal into a hard ball called a bezoar.

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There are hundreds of species of sharks in the world, and they have been around since before the dinosaurs. Albert kok / Wikimedia Commons / CC by 3.0

Every day, sharks suffer from different threats. Up to 100 million sharks disappear every year, due to destructive fishing by humans and the impact of climate breakdown. One-third of the world's known shark species have been listed as "threatened" species by the International Union for Conservation of Nature.

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Bees are responsible for pollinating key crops like apples, and their decline now threatens crop yields. Pikist

Without bees, future generations may not be able to identify with adages like, 'An apple a day keeps the doctor away.'

Crop yields for key crops like apples, cherries and blueberries are down across the U.S. because of a lack of bees in agricultural areas, a Rutgers University-led study published Wednesday in The Royal Society found. This could have "serious ramifications" for global food security, reported The Guardian.

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A tiger in Kanha National Park, India. Ola Jennersten / WWF-Sweden

By Stuart Chapman

The goal set 10 years ago to double the number of wild tigers by 2022 remains one of the most ambitious conservation goals ever for a single species. Currently home to the vast majority of the world's remaining tigers, well-resourced protected areas are a cornerstone of this goal. Tigers are a conservation-dependent species and the persistence of tigers relies on well-funded and well-protected conservation areas.

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More than 260 Chinese fishing boats are just outside the protected waters of the Galapagos Islands. Diego Delso / Wikimedia Commons / CC by 4.0

Ecuador authorities are keeping tabs on a fleet of roughly 260 fishing boats near the Galapagos Islands, a UNESCO World Heritage Site. Ecuadorian boats are patrolling to try to stop the fishing boats from entering the area, according to Reuters.

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Tahlequah, the southern resident killer whale who carried her dead calf for 17 days and more than 1,000 miles, is pregnant again. CBC News: The National / YouTube

Tahlequah, the southern resident killer whale who broke hearts around the world when she carried her dead calf for 17 days and more than 1,000 miles, is pregnant again.

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Pixabay

By John R. Platt

Raging, guttural vocals. Pounding snare drums. Blazing-fast guitar riffs.

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Woodland caribou in northern Ontario. J.H. / CC BY-ND 2.0

By Tara Lohan

A logged forest is a changed forest, and for woodland caribou that could mean the difference between life and death.

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