The opioid crisis in the United States is being fought on many fronts. And one is at O’Hare airport. Meet some of the best four-legged customs enforcers in the world.

As part of a growing movement to undermine the bloody practice of elephant and rhino poaching, Illinois has become the ninth state to ban the sale of ivory and rhino horn.

A recently passed revision to Illinois’ Humane Care for Animals Act clarifies the right of police to take custody of dogs or cats suffering from extreme heat, cold or other life-threatening conditions. 

A groundbreaking program to study urban wildlife using a network of motion-triggered cameras is expanding to Canada and South Africa. 

Each year, self-proclaimed “rednecks” try to rid the Illinois River of Asian carp – one flying fish at a time. We visit the small town of Bath for a look.

As part of a relatively new Lincoln Park Zoo project, guano from bats across the Chicago area is collected and tested for levels of cortisol, an indicator of stress. 

A porcupette, or baby porcupine, was born last month at Brookfield Zoo and is being hand-reared by the zoo’s animal care and veterinary staff. 

Chicago purports to be a dog-friendly city, but when it comes to dog parks, there is a huge discrepancy between the city’s North and South sides. What one dog-lover is doing to change that.

The structures, which look like doghouses without doors or windows, rest atop 12-foot stilts and can accommodate as many as 2,000 bats. Is this the year the bats will move in?

More than 200 medicinal plants grow in a garden on the city’s Near West Side, including species that have led to the development of treatments for cancer and congestive heart failure.

Residents who come across young animals in the city often think they’ve been abandoned. But that’s rarely the case. Learn how to respond when you spot kittens or other baby animals on your block. 

Chicago residents logged more than 50,000 complaints last year about rats, according to a new survey that ranks the city as the “rat capital” of the U.S. We separate rat fact from fiction.

Chicago is losing its last waterfall. We follow up on an earlier story to see the beginning of its demolition in River Park.

Despite its moniker as “The City that Works,” Chicago features plenty of places to get away from the city’s hustle and bustle. Here are 10 spots to zen out in the city this summer.

Next time you step outside to mentally recharge, leave your phone at your desk. A new study finds using electronics outdoors counteracts nature’s restorative properties.

Animal welfare advocates will gather next week at McDonald's new West Loop headquarters to present a petition with more than 200,000 signatures calling on the company to improve conditions for chickens in its supply chain.