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This undated photo provided by the Wildlife Conservation Society shows Nadia, a Malayan tiger at the Bronx Zoo in New York. (Julie Larsen Maher / Wildlife Conservation Society via AP)

A tiger at the Bronx Zoo has tested positive for the new coronavirus, in what is believed to be the first known infection in an animal in the U.S. or a tiger anywhere, federal officials and the zoo said Sunday.

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Side-by-side comparisons show a decrease in nitrogen dioxide over France. (Credit: European Space Agency)

It’s estimated that roughly two billion people around the globe are now under some form of stay-at-home order. This significant slowdown in economic activity has also led to an environmental impact, particularly in the air.

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(Netflix)

“Tiger King” has become a streaming sensation during the coronavirus pandemic, but accredited zoos and aquariums aren’t entertained by the unsavory practices on display.

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Brookfield Zoo recently welcomed a new pair of lions. (Jim Schulz / Chicago Zoological Society)

Brutus and Titus, 4-year-old brothers, arrived at their new home in mid-March. Learn more about the African lions during a Facebook Live chat on Thursday.

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(Courtesy of the University of Illinois)

COVID-19 patients are currently using about 24% of ventilators available statewide, but there’s concern that supplies could run out. To address that possibility, University of Illinois engineers invented a ventilator that can be reproduced on a rapid scale.

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Wildflowers in Busse Woods. (Sajith T S / Flickr)

Most trails remain open in Cook County’s forest preserves, offering people a respite from home confinement during the COVID-19 pandemic, but that could change if people congregate like they did along Chicago’s lakefront. 

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Environmentalists are seething over the EPA temporarily relaxing enforcement rules. (mvpdv0ra / Flickr)

The EPA is relaxing enforcement of “environmental legal obligations” during the coronavirus pandemic, and activists are seething.

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A sample farmers market to-go box. (Courtesy of Closed Loop Farms)

Closed Loop Farms is leading a group of local food producers to deliver everything from Michelin-worthy greens to naturally fermented sodas directly to your door.

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Adler goes for a walk. (Courtesy of PAWS Chicago)

Animal shelters are offering innovative ways to adopt pets during the statewide stay-at-home order. We reach out to two Chicago shelters to find out how the pandemic is changing their operations – but not their missions.

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Keep wipes out of Chicago's sewer system. (Patty Wetli / WTTW)

The Metropolitan Water Reclamation District of Greater Chicago has seen a rise in disinfectant wipes stuck to filtering screens at its water reclamation plants, and it now has some advice for residents.

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Live web cam feeds of nature and wildlife are a great way to bust free of quarantine without leaving home. (Terry Ott / Flickr)

Live web cam feeds of nature and wildlife are a great way to bust free of quarantine without leaving home. Here are 10 to check out.

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(WTTW News)

Gov. J.B. Pritkzer on Wednesday declared the availability of testing for COVID-19 – or the lack thereof – to be the greatest challenge Illinois has faced in combating the outbreak. But he’s hopeful that will soon change.

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We discuss viruses and the role they’ve played in shaping who we are with University of Chicago paleontologist and author Neil Shubin.

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Spring is coming through with signs of life and hope. (Patty Wetli / WTTW)

Snowdrop, crocus, hyacinth and other early spring bloomers are cheering up the gloomy landscape.

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Lucy (left) and Charger, two California sea lions, received shamrock-shaped treats on St. Patrick’s Day at Brookfield Zoo. (Jim Schulz / Chicago Zoological Society)

At least one St. Patrick’s Day tradition is alive and well in these topsy-turvy times. Animals at Brookfield Zoo received special shamrock-shaped treats on Tuesday.

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Arashiyama Bamboo Forest, Japan (Daniel Peckham / Flickr)

Concerns over the spread of the coronavirus have a lot of people working from home, schools closed, restaurants shuttered and sports canceled. Can we even go outside? Yes, say the experts, but still practice social distance.