Cuckoos
Coccyzus americanus
The Yellow-billed Cuckoo is a slender, long-tailed bird often heard more than seen, inhabiting dense deciduous woodlands. Known for its distinctive, knocking call, it is sometimes called the "rain crow" due to its tendency to call before storms. This species is a master at remaining hidden while hunting for large insects.
Typical adult measurements.
Individuals and populations vary.
01 / The telltale details
Start with shape and behavior. Then look for the smaller details.
The bill is mostly yellow on the lower mandible and blackish on the upper, appearing thick and slightly downcurved.
A long tail with wide white bands on the underside and narrower black bands is a key feature.
Warm brown upperparts contrast with clean whitish underparts. A blackish face mask and yellow eyering are also present.
In flight, rufous (rusty red) patches flash on the outer part of the wings.
02 / A place in the world
Yellow-billed Cuckoos prefer open woodlands with dense undergrowth, including moist thickets, overgrown pastures, and orchards. In western regions, they are often found in riparian areas with tall cottonwood and willow trees.
This species breeds across much of the eastern and central United States and parts of southern Canada. Western populations have experienced significant declines and are now patchily distributed in states like California, Arizona, and New Mexico.
A long-distance migrant, the Yellow-billed Cuckoo breeds in North America and winters almost entirely in South America, primarily in the Gran Chaco region. Fall migration typically occurs from mid-August to mid-September, though some individuals may depart earlier or linger later.
03 / Listen a little closer
The Yellow-billed Cuckoo's voice includes a distinctive, rhythmic knocking call, often slowing towards the end, and dove-like cooing notes. They frequently call during the day and sometimes at night.
04 / The life behind the feathers
Their diet primarily consists of large insects such as caterpillars, cicadas, grasshoppers, and katydids. They are notable for consuming large quantities of hairy caterpillars, including tent caterpillars and gypsy moths. Occasionally, they may eat small vertebrates, fruits, or seeds.
Yellow-billed Cuckoos forage by moving through trees and shrubs, gleaning insects from foliage and branches. They may hover briefly to pluck prey or sally forth from a perch to catch flying insects.
Nests are typically flimsy, shallow platforms made of twigs, sometimes lined with leaves, and placed in a bush or small tree, usually 1-3 meters above the ground. Both parents participate in nest building and incubation.
These birds are often secretive and difficult to observe, preferring to remain still and hidden within dense foliage. They are more often detected by their distinctive calls. Breeding often coincides with outbreaks of large insects.
One more reason to pay attention
Yellow-billed Cuckoos are one of the few bird species capable of eating hairy caterpillars, consuming up to 100 in a single sitting.
They exhibit asynchronous egg-laying, meaning there can be a gap of several days between eggs, resulting in chicks of varying ages in the same nest.
The western population of the Yellow-billed Cuckoo is listed as federally threatened under the U.S. Endangered Species Act due to significant habitat loss.
AI-assisted species research. Prepared September 2026. Details can vary across regions and populations.