Cockatoos using both eyes in turn

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Subject: Cockatoos using both eyes in turn
From: "calyptorhynchus ." <>
Date: Tue, 23 Sep 2014 07:26:22 +1000
I've noticed that cockatoo ssp (Sulphur-crested, Galah and Gang-gang) all
seem when they are perched and deciding whether to approach something or
fly down to it, to examine the situation first with one eye, then with the
other. I know they don't have binocular vision, but in birds who do not are
the two eyes different in some respects (light wave-length receptiveness)?
are they getting different information from each eye, or are they just
being ultra-cautious?

John Leonard
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