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(Courtesy Chicago Zoological Society)

The 50-year-old gorilla was the zoo’s oldest animal. “Knowing it’s the right decision doesn’t make it hurt any less,” said Amy Roberts, curator of mammals for the Chicago Zoological Society.

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An African penguin chick hatched Feb. 10 at Lincoln Park Zoo, pictured here at 21 days old. (Courtesy Lincoln Park Zoo)

On Feb. 10, Lincoln Park Zoo welcomed a new baby bird, the first African penguin chick hatched and reared at the zoo's new penguin habitat. 

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A warbling vireo photographed at Montrose Point Bird Sanctuary by Rob Curtis.

Here’s something that might surprise you: The best place in the entire state of Illinois to see birds during their spring migration is in the city of Chicago. 

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Conservationists have installed five bat houses in Cook County since 2016 to provide safe maternity colonies where female bats can give birth and nurse their pups. (Courtesy Friends of the Chicago River)

Three years after they began installing bat houses along waterways in Cook County, conservationists are hoping the bats will start moving in this year.

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(Courtesy Forest Preserves of Cook County)

Despite the early April snow showers, a recent bird sighting in Cook County is a strong sign that warmer spring weather is just around the corner.

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Acanthoscelides calvus (Photo by Laura Rericha)

There are 3,149 different types of plants in the Chicago region. A massive new book details every single one.

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(Jim Schulz / Chicago Zoological Society)

One year after welcoming its first baby reindeer in nearly four decades, Brookfield Zoo added another newborn fawn this week.

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(Courtesy Shedd Aquarium)

For the first time, Shedd Aquarium will host a full week of events leading up to Earth Day on April 22. 

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(Urban Wildlife Institute / Chicago Park District)

A camera set up near Rosehill Cemetery captured an unusual photo of a flying squirrel last fall, but the image was only recently discovered.

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(Humane Society of the United States / Creative Commons)

The grocery store chain released more details this week about its plans to phase out a practice that animal welfare advocates consider inhumane. 

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(Jim Schulz / Chicago Zoological Society)

The yet-to-be-named chick is healthy and being hand-reared by animal care staff, the zoo said this week.

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(Jim Schulz / Chicago Zoological Society)

St. Patrick’s Day festivities kicked off a day early at Brookfield Zoo last week, where seals, camels, lemurs, orangutans and gorillas got shamrock-shaped and green-colored treats.

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Lincoln Park Zoo recently welcomed Talini, a 14-year-old female polar bear who lived previously at the Detroit Zoo. (Roy Lewis / Detroit Zoo)

The 14-year-old female polar bear who recently arrived in Chicago is expected to mate with 8-year-old Siku, who has lived at the zoo since 2016. 

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More than 11,000 people worldwide studied digital images of the liverwort plant as part of a Field Museum-led study that linked research professionals with citizen scientists. (Courtesy Field Museum)

From kindergartners to college professors, citizen scientists helped Field Museum researchers examine more than 100,000 plant samples that could hold clues to key scientific questions. 

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(Courtesy Peggy Notebaert Nature Museum)

A brightly colored moth rarely seen in the U.S. (and bigger than a human hand) emerged from its cocoon Friday at the Peggy Notebaert Nature Museum – but you better get there fast if you want to see it.

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(U.S. Air Force photo / Senior Airman Justin Weaver)

Want to become a certified beekeeper? A new six-course program covers the history and economics of beekeeping, taxonomy of insects, botany, pollination and what to expect during your first year.