PEREGRINE FALCONS

Predatory bird finds penthouse residence in Chicago.

To peregrine falcons, skyscrapers resemble the rock ledges on which they make their nests in the wild. This female has found a home for her offspring on a highrise balcony in Chicago, which offers a splendid view of her hunting grounds. Tall city structures and warm glass and metal surfaces produce rising air currents, on which the predatory birds ride, as they hunt pigeons and ducks in squares and parks.