Staff made the decision to euthanize the North American river otter pup after his health declined over the weekend. “This was an enormously hard decision to make,” said Bill Zeigler of the Chicago Zoological Society.

A pair of bills would strip the state of its authority to regulate endangered species that are protected at the federal level but that might require further protections within Illinois.

Staff at the zoo are caring for the pup because his mother was unable to provide him with proper nourishment. His arrival in February marked the zoo’s second successful birth for this once-endangered species.

We get up close and personal with some cold-blooded creatures ahead of the nation’s largest educational reptile show.

Sometimes the best thing for a forest or prairie is to burn it. We spend a day with a Cook County burn crew.  

Renowned University of Chicago paleontologist Neil Shubin recently returned from an expedition to search for fossils in Antarctica. He tells us about his trip.

The city’s gleaming skyline and its position along a busy migratory corridor make it the most dangerous in the U.S. for birds traveling north and south each fall and spring, a new study finds.

The zoo is no longer offering a program that allowed visitors to touch or interact with a handful of different animals, citing research showing that some animals display signs of stress after being handled by humans. 

Kapuki, a 13-year-old eastern black rhinoceros, is expected to give birth to a baby calf in May. 

Each year, Chicago Animal Care and Control takes in more than 3,000 stray dogs and 3,000 stray cats on average, but only a fraction of them are reunited with their owners. How a new app could help link lost pets with their owners.

Chicago Animal Care and Control was so packed with cats late last summer that it sent out an urgent call for adoptions. Now, the department seems to have found a solution to one of its biggest challenges: overcrowding.

The complex and relatively advanced cultures of chimpanzees are disappearing as human beings encroach on previously undisturbed areas of African forest, according to a new study involving researchers from Lincoln Park Zoo.

A severe drought earlier this year forced a large group of flamingos to flee a nesting site in South Africa. That’s when Lincoln Park Zoo and other wildlife conservation groups from around the world stepped in.

For more than half a century, a plant at the Garfield Park Conservatory has been growing slowly and imperceptibly. Until last fall. We visit the rapidly ascending century plant.

The unnamed pup, born Dec. 15, can be seen alongside his mom on select days in the zoo’s “Tropic World: Africa” exhibit.

The tiny African antelope born on Valentine’s Day was euthanized Tuesday, according to zoo officials, who identified a birth defect that affected the animal’s ability to swallow normally.