Why Peregrine Falcons Choose City Skyscrapers as Their Perfect High-Altitude Family Homes

Nature · Published 29 September 2026 · Updated 21 October 2026 Swipe more like this →

In short: Peregrine falcons are the fastest animals on Earth, capable of reaching 240 miles per hour. Yet, these aerial predators often trade wild cliffs for urban towers to raise their young. From defending nests against intruders to surviving the threat of extinction, their parenting journey is as intense as their flight.

Peregrine falcons, such as the pair known as Annie and Grinnell, have made a home atop a 300-foot bell tower at the University of California, Berkeley, since 2017. These birds do not construct traditional nests of twigs or leaves. Instead, the female creates a simple bowl-shaped depression, known as a scrape, on a ledge to keep eggs from rolling away. Tall urban buildings serve as ideal substitutes for the natural cliffs they inhabit in the wild, providing high perches for hunting pigeons and protection from predators.

Parenting for these raptors is a demanding, territorial affair. In late March, Grinnell was observed aggressively defending his nest from a larger, younger female intruder attempting to scout the site for a potential takeover. Once the eggs hatch, the parents must work tirelessly to provide meat for their screaming chicks. This fierce protection is essential for the survival of the next generation of the world's fastest animals, which can dive at speeds exceeding that of a single-engine plane.

The species once faced a near-extinction event due to the widespread use of the pesticide DDT in the United States, which was utilized from the 1940s until 1972. The chemical accumulated in the falcons' bodies, disrupting embryo development and causing eggshells to become so thin that they would shatter under the weight of the parents. Today, these birds are a common sight in major cities like New York, Chicago, and San Francisco, marking a significant recovery for a raptor that thrives in the heart of the human-built environment.

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