Four calling birds
So what exactly is a Calling Bird? Shouldn’t it be a Colly Bird? Which is apparently any Black [black – coal] Bird, but originally a Blackbird as in the nursery rhyme Sing A-song-sixpence with its four and twenty blackbirds baked in a pie [a common source of food in Medieval times, for the well off at least].
Even a Raven or Crow is technically a Colly bird. Both of which have very rich mythological and wider cultural associations.