PITTSBURGH -- Three peregrine falcon chicks were banded Tuesday after hatching last month on top of the Cathedral of Learning on the University of Pittsburgh's campus.

Live Nest Camera: Check out the webcam of Pitt's peregrine falcons

The birds are considered endangered in Pennsylvania. Bands were placed on their legs, making it possible for the National Aviary to identify and track them in the future.

"Hopefully when we put a band on these birds, sometime down the line, they will breed somewhere or turn up somewhere, and somebody will be able to identify where it's from," said Dr. Todd Katzner of the Aviary.

Dorothy is the female parent at the chicks' nest in Oakland, according to the aviary.

The male peregrine, Erie, isn't at the nest any more, so he may have been replaced by another male.

Dorothy and Erie fledged four chicks that were all banded in May 2007.

Erie fought off an invading male in March 2007, the aviary said.