Dear All
I don't have much to say about plumage and other characteristics, but a
point of order on size. It depends what you mean by 'twice the size'. It's
clearly not 'twice the length'. But by the measurements given, it is roughly
15.4% bigger in length, which may imply that it's also 15.4% wider and 15.4%
taller - which in three dimensions means it's 1.154 x 1.154 x 1.154 times
the volume, which is 54% 'bigger' - maybe a bit off 'twice the size' but not
that far out and probably within tolerance to the naked eye. In fact, it
would only need to be 25% longer in each direction to be 'twice the size',
so that extra 6cm would only need to be just about 10cm.
Just to reinforce the point, my 50L esky doesn't look all that much bigger
than my 25L one!
Cheers
Tim
From: "Philip Veerman" <>
To: "Simon Mustoe" <>,<>,
<>
CC:
Subject: [Birding-Aus] Gull
Date: Tue, 21 Nov 2006 17:56:01 +1100
Simon,
If by Black-tailed Gull we are referring to Larus crassirostris, then not
only is it in the same family (Laridae) as the Silver Gull Larus
novaehollandiae, but it is in the same genus (Larus). So, sorry but you
have your wires crossed in suggesting they are in different families. They
don't look that much different in shape either and I suspect just by a
quick look at Geoffrey's, picture and description that it is probably not a
Silver Gull.
Philip
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