Since 2007, a pair of peregrine falcons has lived atop UMass Lowell's 18-story Fox Hall, the tallest building in Lowell.
The university and the state Division of Fisheries and Wildlife built a nest box to provide the birds with shelter and installed a webcam, available at www.uml.edu/Falcons, which lets viewers watch the falcons in their urban habitat. Peregrine falcons are an endangered species in Massachusetts.
This year, three chicks were born about a month ago. Wednesday, state wildlife officials checked on the chicks and attached their leg bands. Veteran photographer Ken Yuszkus was on hand to capture the event.