rainbird

/ˈreɪnˌbɜrd/
noun
  1. Any of various birds whose call is thought to predict rain, such as the green woodpecker or certain cuckoos.
    • The rainbird called loudly before the afternoon storm.
    • The rainbird's song is a familiar sound in the rainy season.
    • In folklore, hearing a rainbird means you should carry an umbrella.