Wildlife
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Tiny plastic pellets found on 73% of UK beachesGreat Winter Nurdle Hunt finds thousands of pellets used in plastic production washed up on shorelines around country
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Mary Welsh obituaryOther lives: Naturalist whose books inspired thousands to explore northern England and Scotland
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'Extraordinary' levels of pollutants found in 10km deep Mariana trenchPresence of manmade chemicals in most remote place on planet shows nowhere is safe from human impact, say scientists
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Canada reintroduces bison to Banff national park after more than a centuryHelicopters transport 16 of the large mammals to site in Alberta as scheme restores once-dominant grazers to ecosystem
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Act now before entire species are lost to global warming, say scientistsClimate change is threatening about 700 endangered species and policymakers must act urgently to lessen impact
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Why we need to map all Earth’s critters, quickLetters: To date we have only mapped 20% of all known species, with invertebrates and the “small things” being the most elusive
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Hope for end to New Zealand whale strandings after 350 dieAbout 650 pilot whales beached themselves at top of South Island, with 350 dying but others either swimming away or refloated by volunteers
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Environmentalists warn of bumblebee's extinction after Trump halts regulationsOrder for 60-day pause on regulations not yet implemented includes protection for endangered rusty patched bumblebee, which experts say is near extinction
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The week in wildlife – in picturesA tiger family drinking at the watering hole, a nightingale and a snake that plays dead are among this week’s pick of images from the natural world
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The world's most unloved, underappreciated wildlife – in picturesDo you like pangolins or silky sharks? How about the black-legged kittiwake? Vote for your favourite in the Wildscreen Arkive’s Valentine’s Day campaign to help protect underappreciated species from poaching and climate change
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With a head-pumping strut, the cattle egret stalks around the cowsCountry diary: Warblington, Hampshire By associating with large ungulates, these birds can obtain up to 50% more food using two-thirds of the energy required for lone foraging
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Volunteers try to save whales at New Zealand beach after mass stranding – videoDozens of volunteers form a barrier in Golden Bay in an effort to prevent more whales from stranding themselves after hundreds died there on Thursday night
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Hundreds of whales die in mass stranding on New Zealand beachUrgent plea issued for locals to drop work and school commitments and head to the remote beach to save surviving whales
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Winter migration of monarch butterflies to Mexico drops after one-year recoveryExperts say decline to coverage of only 7.19 acres of forest could be due to late winter storms last year that knocked down more than 100 acres of trees
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Ivory is not beautiful, it’s barbaricI grew up with a piano in my bedroom, but now the thought of ivory fills me with revulsion. The UK needs to impose a total ban on the trade of elephant tusks
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Snake regurgitates tennis ball after mistaking it for food – videoA 1.5m-long carpet python manages to regurgitate an entire tennis ball after it was found swollen in a residential yard
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Patagonia pulls out of Utah trade show in protest of state's public land grabCompany founder has urged Utah governor to stop trying to undo the decision by former president Obama to create the Bears Ears National Monument
Jonathan Jones on art Ivory tells the history of the world – it must never be banned