The all-day event Saturday will take advantage of a sweet spot in the migratory timeline, with organizers expecting to record outgoing and incoming species.

Each week, 200 South Side households receive a free delivery of fresh produce, thanks to a collaboration between Star Farm and Experimental Station. To keep the program running through October, organizers need to raise $20,000.

Earth sweltered to a record hot September last month, with U.S. climate officials saying there’s nearly a two-to-one chance that 2020 will end up as the globe’s hottest year on record.

The Field Museum is looking for volunteers to help digitize 100-year-old handwritten field notes and specimen labels in order to make the information more accessible to researchers.

Far more Chicagoans may have been infected by COVID-19 than previously thought. We discuss the preliminary findings of a new study with Dr. Elizabeth McNally of Northwestern University Feinberg School of Medicine.

From apples and pumpkins to pig races, hay rides, petting zoos and beyond, we’ve rounded up some options for fall fun in the Chicago area.

Officials put out a call Friday for nominations for Chicago’s official Christmas tree. Pines need not apply.

Oak was once the predominant tree in the Chicago area. Now most of them are gone. Ecologists have a plan to make sure they don’t disappear from the region entirely, and they need our help.

Students from Village Leadership Academy will be honored Oct. 16 at Friends of the Parks’ “Parks as Democracy?” annual conference, which will include a presentation from the youth activists.

There’s still a lot that scientists don’t understand about what makes trees tick, especially when it comes to fall color. A team at the Morton Arboretum is working to unlock those secrets.

Chicago-based artist Raychel Steinbach has designed a series of prints that celebrate individual Illinois state parks. Now she’s using the same imagery, inspired by places like Starved Rock and Moraine Hills, in a line of handmade masks.

The goal of contact tracing is to alert people who may have been exposed to someone with the coronavirus, and prevent them from spreading it to others. But the process isn’t easy. 

A herd of 65 sheep and goats replaced more traditional mowing equipment this summer at MWRD’s Calumet Water Reclamation Plant, where the animals helped maintain the native prairie landscape. 

It's mating season for deer, which means more are on the move at dawn and dusk — prime time for deer-vehicle collisions. Cook County led the state in 2019 with 472 crashes.

Thursday’s full moon is the harvest moon, coming closest to the autumnal equinox. It will have some celestial company on Friday in the form of Mars, when the two will rise together and stay paired throughout the evening, according to experts.

It’s Fat Bear Week. No, we’re not mocking Matt Nagy’s squad, we’re talking about the annual competition to crown the beefiest brown bear in Alaska’s Katmai National Park. Here’s how to get in on the action.