Kwubba-wubba.
Ow (prolonged, a peculiar musical piping note).
Polyglot (or something remarkably like it).
Quar-r-r-r.
Quor-r-r-r-r-r (very prolonged, and deep, as in remonstrance).
Quow-yow, or yow-quow.
Shook, shook, shook (soft and quickly repeated. Have heard it uttered by rooks when flying home belated, after the great majority had settled in the roosting-trees).
Tchar.
Tchar-r-r (with a little roll in it).
Tchu or tew.
Tchoo-oo (very deep and guttural).
The peculiar "burring" note (uttered, but by no means always, when the birds swoop down on to trees, especially the roosting-trees. It is not heard very frequently).
A peculiar sound like a kind of bleat, with a very complaining tone in it.
A short, sharp, single note, much higher than the ordinary caw.
A kind of grating scream, much higher than the usual tone.
A hoarse "mew," or "miaul" almost, as though a rook were trying to imitate a cat, or a cat a rook.
The liquid castanet-note in the throat, suggesting the "burr," but not quite it.
Various other curious little sounds in the throat, some of them clicks.