The wail, yodel, and tremolo calls are sounded more frequently at night than during the day; calls have also been shown to occur more frequently in cold temperatures and when there is little to no rain.
O laio, o yodel e o trémolo son chamadas que fai máis de noite que polo día; as chamadas ocorren máis frecuentemente con temperaturas frías e cando chove pouco ou nada.