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The Evolution of Australia's Corvids
Corvus is a cosmopolitan genus of over forty species. Australia's five ravens and crows are members of the genus.
Australia's Corvids have white eyes and a general similarity to one another that occurs nowhere else. It is conjectured that they diverged from a single ancestral population that arrived when Australia was a forest-covered continent, around ten thousand years ago.
Sources:
The conjecture is outlined in: Readers Digest, Complete Book of Australian Birds, 2nd Edition, Sydney, 1997
The maps were drawn by Michael Gallager. The species boundaries are representational only.
