Peregrine Falcon Nest

The peregrine falcon nest off the 41st floor of the Cathedral of Learning. The falcon pair only nests there in the spring. We visited in September, so the nest had been long empty. During the spring, no one is allowed to go outside. The falcons are quite protective and will attack. Heiber told a funny story about contractors hired to sandblast the exterior of the Cathedral poo-pooing any worries about the falcons--that is, until the first time they were dive-bombed. After that, caution ruled.