Why do possums survive aerial poisoning operations?

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" Why do possums survive aerial poisoning operations? "
Morgan, D. R.; Batcheler, C. L.; Peters, J. A.

Document Type	:	AL
Record Number	:	944273
Doc. No	:	LA4qn8k2mz
Language of Document	:	English
Main Entry	:	Morgan, D. R.; Batcheler, C. L.; Peters, J. A.
Title & Author	:	Why do possums survive aerial poisoning operations? [Article]\ Morgan, D. R.; Batcheler, C. L.; Peters, J. A.
Title of Periodical	:	Proceedings of the Vertebrate Pest Conference
Volume/ Issue Number	:	12
Date	:	1986
Abstract	:	Major causes of failure of aerial poisoning operations against possums identified were: sublethal toxic loading, undersize sublethal baits, nonlearned behavioural aversion to 1080, and failure to encounter bait. Dislike of bait was not a major cause of failure. Progress has been made towards solving these problems, but failure to encounter bait remains a likely major reason for possums surviving aerial poisoning. Improvements in the aerial sowing of bait are essential if the full benefit of this progress is to be realised.