Potential for 2ndary poisoning of ravens eatingpoisoned rats?

To: "Wendy" <>, "Birding-aus" <>
Subject: Potential for 2ndary poisoning of ravens eatingpoisoned rats?
From: "michael norris" <>
Date: Tue, 4 Sep 2007 11:58:33 +1000
Hi Wendy

Not sure what "block" rat poisons means but second-generation anticoagulants
(successors to the first-generation like Warfarin, to which rats are
breeding resistance) are cumulative.  They contain agents like brodifacoum
which can cause secondary poisoning of scavengers or predators which go for
weakened (dying) rats.

Earlier this year the USA EPA proposed banning the sale of at least some
of these to the public. See:

I agree about Racumin being more desirable (until the rats build up
resistance against that too!).  See John Young's work on encouraging owls to
control cane rats.

Michael Norris

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