I have only just come in on this discussion.  I recollect similar 
confusion over a 16th century portrait of a child, I think a young 
Russell from the Duke of Bedford's family, with a yellow-crested 
cockatoo - the conclusion was that it was a Wallacean species, which 
would have come to Western Europe with Dutch East Indian trade.  Plumes 
from Birds of Paradise were traded along the Spice Routes, and I see no 
reason why a live Cockatoo might not have survived long-distance travel. 
Large seed-eating birds are not hard to transport.
  The Tigers occasionally seen in Rome probably came from Persia - 
there used to be a Caspian subspecies, probably now extinct.  They were 
found in forested regions, while lions were found in more steppe-like 
habitats.  I believe that a very few Leopards still survive.
Anthea Fleming
On 19/03/2014 2:15 PM, Andrew Taylor wrote:
 
Parrots (Psitticula sp.) apparently survived the journey from India
to ancient Rome, so its quite plausible a cockatoo would survived
a longer journey 2000 years later.  Tigers which are less portable -
also apparently survived the journey to ancient Rome from India.
Andrew
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