Life as an amphibian is no easy hop through the woods. Why Chicago scientists are measuring levels of cortisol (the stress hormone) in Lake County frogs.

Lincoln Park Zoo will give away hundreds of condoms this week as part of a nationwide outreach program to draw attention to the link between human population and endangered species.

Like many humans approaching their elder years, a 49-year-old western lowland gorilla named Ramar has been dealing with knee pain.

On a mission from Chicago, two Shedd Aquarium staffers have been providing around-the-clock care for a sea otter pup rescued in Alaska. 

The striped “forest giraffe” is the 28th okapi to be born at the suburban zoo since 1959, when it became the first zoo in North America to have a birth of the species.

For the first time, Brookfield Zoo is exhibiting a pangolin, a rare animal native to Africa and Asia.

A west suburban forest preserve is dispatching an army of freshwater mussels to clean up contaminated waters. “They may be small, but they have enormous beneficial effects on the lives of other organisms,” said one staff member.

Experts in Chicago are working to save one of the world’s most endangered birds. 

The ethical debate over zoos – and whether animals belong in them – has resurfaced over the past year, and now Brookfield Zoo is joining the discussion.

The tale of the Western pond turtle was one of several success stories shared with donors Monday evening at a Shedd Aquarium event focused on conservation efforts nationwide. 

For the fifth year, members of Shedd Aquarium's Animal Response Team participated in a rescue mission of endangered penguin chicks in South Africa. Learn about their work.

Alligator snapping turtle Patsy McNasty moved into a new 300-gallon tank this week at Chicago's Peggy Notebaert Nature Museum, where visitors attended a “housewarming” event for the 14-pound turtle. 

The newborn female Bornean orangutan joins five other orangutans living at the Brookfield Zoo.

Meet a former elite soldier from Australia who is now using his special set of skills to combat poaching in Africa.

The eastern massasauga rattlesnake, also known as the “swamp rattler,” produces venom more toxic than most other rattlesnakes.

The Shedd Aquarium is calling on President Barack Obama to sign legislation that aims to curb the highly lucrative, international business of illegally trading endangered and threatened animals.