Hiss Majesty, a 16-year-old Caiman lizard at the Shedd Aquarium, was fitted for a new prosthetic limb on Wednesday.

Two Chicago-area institutions are the first in the nation to receive certification in a new program that assesses the well-being of animals held in captivity.

The Shedd Aquarium has added a new source of power as part of its green initiative – and it isn’t coming from the institution's electric eels.

Granddad is believed to be the oldest fish in captivity at any public aquarium or zoo in the world. The Shedd estimates he’s at least a century old and that an “excess of 100 million visitors” have passed through the aquarium since his arrival.

The Shedd Aquarium has a new CEO in Bridget Coughlin. She joins "Chicago Tonight" to talk about her varied experience and what she anticipates for the future of the beloved aquarium.

Coral reefs evolved 240 million years ago, but now scientists say coral reefs could be gone before the end of this century. They say the biggest threat is the warming ocean water. Three major institutions in Chicago are now actively engaged in the fight to save the coral reefs.  

After Lurie Children’s Hospital of Chicago patients, families, staff and volunteers took part in a voting contest last week, the 10-month-old penguin previously known as Chick No. 23 is now called Diego.

Shedd Aquarium staff are watching a 28-year-old female Pacific white-sided dolphin and her newborn calf around the clock during what they call "a very crucial time."

A 10-week-old sea otter pup rescued after a rough storm in California last month is recovering at her new home in Chicago.

The Shedd Aquarium recently announced a new arrival at the Chicago institution and it's definitely not the creature you'd expect it to be. We went to the Shedd to investigate its latest rescue, named Peach.

Bridget Coughlin will replace current CEO Ted Beattie, who retires this year.

A new special exhibit opens on Saturday with 40 species of amphibians. We talk with the Shedd Aquarium's Special Exhibits manager about the "ribbiting experience."

Shark Week is back. We discuss our continuing fascination with the ocean's top predator with shark expert Lise Watson of the Shedd Aquarium.

Two Shedd Aquarium Great Lakes researchers found a huge school of fish underneath Chicago's harbors last week. The fish are gizzard shad, a type of herring and major schooling or forage fish, often seen in large groups. Read an article and watch a video.

A close look at the creatures that inhabit the Great Lakes; a wide variety of snacks for foodies; and The Jungle Book at the Goodman Theatre. Chicago Tonight knows what's going on this weekend.

Elizabeth Brackett reports on how the Shedd Aquarium is drastically cutting its energy consumption.