An owl loving Chicago photographer takes us along as he shoots a majestic snowy owl during the last “invasion” in 2014.

A paternity test to determine the sire of four Japanese macaques born since 2014 at Lincoln Park Zoo came back with a surprising result. 

It might sound like an episode of “The X-Files,” but a story reported Saturday by the New York Times sheds light on an official Pentagon program that researched and investigated unidentified flying objects.

Meet Drake, Magdalena, Pebbles and Wellington. They are the first penguins to turn 30 at Shedd Aquarium, and among the oldest penguins in human care across the U.S.

Bird enthusiasts are enjoying an “invasion” of snowy owls in Chicago and across northeastern Illinois this winter. Check out our map of recent snowy owl sightings.  

From siblings with snowballs to wrestling chimpanzees, playful behavior is usually easy to spot. But the question of why we play – and whether we all play for the same reasons – is less apparent.

For 70 years, hunters have been shooting waterfowl at Wolf Lake on the city’s Far South Side. It is the only state park within city limits, and one of the only places to hunt in Chicago. We go for a visit.

Babies born within 2 miles of a fracking site are more likely to suffer negative health effects, according to a new study co-authored by a professor at the University of Chicago. 

Surfer environmentalists and the University of Chicago intend to sue U.S. Steel over toxic Lake Michigan spills after it twice released more than the allowable quantity of a cancer-causing chemical into the waters this year.

It’s open season for hunters of Canada geese, but the migrating birds have found a novel way to stay out of the firing line: wintering in the city. Rabiah Mayas joins us with that story and more from the world of science.

Over the past year, staff from Shedd Aquarium’s Animal Response Team have come to the aid of animals across the globe. Here’s an update on how some of them are doing.

Thanks to a new U.S. Department of Energy grant, UIC’s Energy Resources Center will promote and help install high-efficiency combined heat and power systems across the Midwest.

Public officials gathered Monday to celebrate the completion of stage one of the McCook Reservoir, which will offer 10 billion gallons of storage capacity to prevent flooding once complete in 2029. 

The nuclear age was triggered in Chicago 75 years ago this week. We remember that fateful day, the man behind it and the lingering implications.

Conservation groups say the federal government needs to spend more to save monarchs, the beloved black-and-orange insects whose population has dropped in recent decades.

Horse-drawn carriage rides are popular with tourists, but animal welfare advocates say the practice is inhumane—and that Chicago’s three carriage companies are routinely breaking the rules.