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17â€“20 cm (6Â½-7Â¾ in) An uncommon, secretive bird. Named for the yellow on the lower mandible of its somewhat decurved bill. The underparts of this bird are contrasting white and the primaries are rufous.
 Similar species
Yellow-billed Cuckoo has inner webs of primaries brown (not white like Pearly-breasted Cuckoo) and shows some rufous on wings.
Breeding migrant found throughout the United States, but losing habitat in the west due to destruction of riparian woodlands. Not to be expected in Canada. Breeds locally in Mexico, and possibly in the northern half of Central America.
Recent results suggest that at least part of the US population after having bred in early parts of summer migrates to north-western Mexico where a second round of breeding takes place before the birds go on the final migration to their winter home.
Occasional autumn vagrant to western Europe
Found in woodlands with clearings, usually with water or wet regions.
Moves about stealthily in dense foliage, rarely perching in the open.
Gleans insects, notably hairy caterpillars, from leaves and branches. Extremely fond of tent caterpillars, important for keeping outbreaks of the insects under control.
Young: Altricial but alert and active within minutes of hatching. Shiny black skin, no down. The young develop incredibly quickly - the entire period from egg laying to fledging lasts only 17 days. On day 6 or 7 after hatching, the feathers of the young burst out of their sheaths, allowing the nestling to become fully feathered in only 2 hours.
Gives a wooden-sounding, guttural ku-ku-ku-kddowl-kddowl or a deep cloom similar to a dove.
 In Culture
Once known as "Raincrow" due to its apparent tendency to call more frequently on stormy days.
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