the lower mandible is yellow with a black tip. Immature yellow-billed cuckoos look similar to the adult but have buffy undertail coverts. The undertail pattern is muted and the tips of the ...

The yellow-billed cuckoo is sometimes called the "rain crow" because its song is often heard just before thunderstorms or summer showers. But this rare bird raises its voice less and less often in ...

The yellow-billed cuckoo is sometimes called the "rain crow" because its song is often heard just before thunderstorms or summer showers. But this rare bird raises its voice less and less often in ...