American Kestrels: Tiny Falcons, Mighty Pest Control for Your Property

The American kestrel (Falco sparverius) is North America's smallest falcon and a fierce predator of invertebrates, small rodents, and small birds. Males sport a distinctive slate-blue head, rust-colored back, and unique black markings. They can see ultraviolet light — detecting vole urine trails for hunting. Year-round across much of North and South America.

Habitat & Hunting

Attracted to human-disturbed habitats: pasture, parks, urban areas. Like most raptors, they prefer open areas with sparse vegetation and scattered trees for perch-hunting. Open shrubby fields provide cover for caching surplus small mammals (for when invertebrates are scarce). They hide food in dense grasses, shrubs, tree roots, cavities. Dense cover also provides shelter from weather and larger predators (goshawks, red-tailed hawks, barn owls, Cooper's hawks).

Daytime hunters: perch, watch, swoop, clasp prey in talons. May carry larger prey or eat on ground while staying alert.

Identification

Males: Coppery back/tail, bluish-gray wings/head, black/white facial streaks, black body speckles. Females: Tannish-red wing pattern (not blue), blue-slate head with black/white markings, brown/white chest streaking. Both ≤12 inches, <½ lb — small, light, quick, stealthy.

Attracting Kestrels

Ideal Hunting Habitat

Open woodlands/fields with thick native grasses, shrubs, trees → diverse insects (grasshoppers, cicadas, beetles, dragonflies, scorpions, spiders) and small mammals (voles, mice, shrews, bats, songbirds). Find native plants for your region.

Nest Boxes — Highly Recommended

Kestrels use nest boxes with specific specs. Populations declining in many areas — every box helps. Place on tree/pole 10–30 ft high. Entrance: 3-inch diameter, 14-inch depth. Cornell's NestWatch has detailed plans — great youth/community project teaching bird ecology.

Male finds cavities (old nests, tree hollows, rock crevices, building nooks); female approves. No nesting material collected — just move debris, lay 4–5 eggs at cavity bottom. 1–2 broods/season.

Reward: feisty chicks to watch next spring/summer, plus complimentary rodent control from busy parents.

More: KestrelCam footage, calls, and info at NestWatch.