I can't comment on the number of "caws", but pitch is the most significant
(if not only) way of separating the two Ravens on call.
Australian Ravens have a relatively high-pitched wailing call; the last
"caw" is usually drawn out and decending in pitch. Little Ravens have
shorter, deeper "caws". I've heard Australian Ravens doing a similar
call as the Little Raven, but the long last note and/or reversion to
their regular call gives them away. (I've never heard Little Ravens
sound like Australian Ravens.)
--
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Paul Taylor Veni, vidi, tici -
I came, I saw, I ticked.
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