Assuming that what Dean tells us is correct, are
Australian birds unusually tame or are Alabaman, USA birds unusually
cautious? As in what is the baseline? Sure his comments about the potentially
confiding nature of many of our birds are quite true. As for what it is based
on, I would point out that rails are an atypical group as they are often very
hard to approach on large land masses but easily become very tame in particular
situations such as islands. They are also very prone to evolving flightlessness
apparently rather quickly.
Philip
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