Yellow-billed Cuckoo

Look for

A slim, long-tailed bird — smooth brown above, crisp white below, with a curved yellow lower bill and bold white spots along the black underside of the tail. In flight, the underwings flash warm rufous.

They move slowly and quietly through foliage, often perching motionless — you'll hear them long before you see one.

Size: ~12" — longer than a robin, but more than half of that is tail.

Listen for

• The rain-crow song: a slow, hollow, wooden "kuk-kuk-kuk-kuk-kuk-kowlp-kowlp-kowlp" that starts fast and slows at the end, dropping in pitch. Unforgettable once you learn it.
• Also a softer "cooo-cooo-cooo" cooing sequence.
• The sound of Southern summer woods at noon, when nothing else is singing.

Where in Memphis

Every deciduous forest edge and bottomland in the metro — but they're secretive and underseen.

• Overton Park Old Forest
• Wolf River Greenway (reliable in summer)
• Meeman-Shelby Forest
• T.O. Fuller
• Shelby Farms wooded edges
• Even large backyards with mature trees

Much easier to hear than to see.

Behavior

• The caterpillar specialist. Yellow-billed Cuckoos eat hairy and spiny caterpillars that most birds refuse — tent caterpillars, fall webworms, gypsy-moth larvae. They've been recorded eating 100+ caterpillars in a single meal.
• Population booms during outbreaks. When tent caterpillars or periodical cicadas emerge in huge numbers, cuckoo populations locally explode. Cicada summers are cuckoo summers in Memphis.
• Quiet and slow. They move more like a Mourning Dove than a songbird — sit, look, shift, sit again.
• Build minimal nests. A flimsy twig platform, sometimes barely enough to hold the eggs.
• Occasional brood parasites. Yellow-billed Cuckoos sometimes lay eggs in other birds' nests (their own species and others) — a low-grade cousin of the European Cuckoo's full cheating strategy.

Story & folklore

"Rain Crow" — the weather prophet

Across the American South — and especially the Delta and mid-South — this bird is the "rain crow". Folklore says it calls before a storm. Old farmers and river-workers took the call as a genuine forecast, and many Memphians still call them rain crows today.

Is it real? Partially. Cuckoos do call more often in humid, still, overcast weather — conditions that often precede Southern summer thunderstorms. The correlation isn't magic; it's atmosphere. But it's reliable enough to name a bird after.

Disappearing English

"Rain crow" is one of the best-preserved regional bird names in American English — still used across Appalachia, the Ozarks, the Delta, and the mid-South. In a century where most folk names have evaporated, this one lives.

The Western population is collapsing

The Western Yellow-billed Cuckoo (populations west of the Rockies) is federally threatened — its riparian cottonwood habitats have been largely destroyed. Eastern birds, including Memphis's, are faring much better. Memphis is holding a population of a disappearing species, even if it doesn't feel that way on a June morning.

The cicada connection

Periodical-cicada emergence years (every 13 or 17 years) are boom times for cuckoos. The mid-South has had several big cicada summers in recent decades, and Memphis-area cuckoo sightings spike during them. If you hear unusual amounts of rain-crow calling during a cicada year, that's why.

Fun facts

• Cuckoos molt their stomach lining after eating too many hairy caterpillars — the stomach fills with spines, then the lining is shed and regrown.
• They fly low and direct between perches, usually under the canopy — not up in the open.
• The black-billed cuckoo is a near-twin species that migrates through Memphis but rarely breeds here — look for the black bill and red eye-ring for ID.
• Their scientific name Coccyzus comes from Greek for "to cry 'cuckoo,'" even though American cuckoos don't actually say "cuckoo" like European ones.
• Yellow-billed Cuckoos can swim briefly if knocked into water — unexpected from such an arboreal bird.
• They migrate at night, crossing the Gulf of Mexico like the warblers, and winter in South America — some reach as far as Argentina.

Field notes (to add)

• Audio: the full rain-crow "kuk-kowlp" song, slowed down and normal speed
• Caterpillar-outbreak photo comparison
• Cicada-year calling frequency (informal data)
• Memphis regional mnemonics / folk weather sayings involving rain crows