Two years ago, amateur photographer Josh Feeney spotted a nest of owls within a Cook County forest preserve. Since then, he's returned to the site to check on the rare species and recently found evidence of successful breeding.

What our age may or may not say about our health, why some people may be “hardwired” to experience chronic pain, and a possible explanation for the ice geysers on Saturn's moon Enceladus. Rabiah Mayas joins “Chicago Tonight” to examine these stories and more. 

A brand new water treatment facility that takes wastewater and creates high-grade fertilizer comes online for the Metropolitan Water Reclamation District in Stickney.

Since 2003, a group called the Chicago Bird Collision Monitors has made it their mission to collect birds that have been killed or injured after striking buildings and other structures.

A Northwestern University graduate student is combining his love of music and astronomy to stage a solar system-inspired concert.

With fewer than 1,000 Bactrian camels estimated to be living in the wild, the species is classified as critically endangered. On May 9, a Bactrian camel calf was born in Chicago.

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.

Inside a 12,000-square-foot greenhouse on the Northwest Side of Chicago, thousands of fish – and the waste they produce – are an essential part of an innovative growing method called aquaponics. 

He's best known for having killed Pluto, but astronomer Mike Brown may have found a replacement planet in the outer reaches of our solar system and it forms the basis of a new Adler Planetarium show.

Two Mexican gray wolf pups born at Brookfield Zoo last month were released into the Arizona wilderness as part of a carefully timed conservation effort. The species has been threatened by extinction for over half a century.

The second annual festival promises a treat for the scientifically curious, whether your interests lie in psychology and neuroscience or Chicago's urban wildlife and HBO's popular "Game of Thrones" series.

Four of Chicago's river bridges are turning 100 this year, bringing the total of river bridges in the century club to 24. We talk with expert Patrick McBriarty about how the river bridges keep Chicago moving. 

The migratory birds are starting to nest in the area, but their nests don't look like those found in trees. That's because purple martins, which spend their winters in South America, now rely almost entirely on man-made nests when they arrive each spring. 

How local forest preserves are using fire to maintain the Chicago area's natural ecosystem, much like Native Americans did prior to European settlement.

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.  

The National Bison Legacy Act aims to put the largest land mammal in America on the same level as the bald eagle, the country's national bird and a cultural symbol of independence.