As I started this by privately querying the claim of Water Rat at the
Edithvale Wetlands (unlikely and not known to occur), I suppose I should
contribute to this discussion.
Firstly, to me, Peter Shute's photos were obviously of Brown Rat currently
conspicuous around the hide where persons assemble to watch the Painted
Snipe. In the field they are clearly that species because of their
considerable size (mass) and unpleasant appearance. There is a colony on a
nearby island. I find that whereas Brown Rats there often have a pale base
to their tail, Black Rats tend to have a wholly black tail and are rather
cute.
But Black Rat is also present. Whilst doing a survey there on Tuesday 4
November, Andrew Silcocks and I saw one taken by a Swamp Harrier from high
(over 1 m above water level) in the typha (cumbungi) adjacent to the hide.
Clearly seen in the Harrier's talons we claim support for this ID because
the animal was high in the rushes. Brown Rats can't climb the reeds! They
stay on the ground.
A study of Australian Reed Warblers at this site a few years ago identified
rats as the primary predator of their nests. They were caught in the act by
Video cameras.
Mike Carter
30 Canadian Bay Road
Mount Eliza VIC 3930
Tel (03) 9787 7136
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