The science does not agree with you.
Mohua were one of the most prolific birds in our beech forests... Read the threats and conservation, also read where they are making a comeback in areas where effective rat and stoat control is taking place. 1080 is effective rat and stoat control.
Yellowhead | New Zealand Birds Online
Here is something from many many years ago where you can see the decline long before the use of 1080. Read what was there..and now read the reason for the decline.
http://docs.niwa.co.nz/library/public/OPNZDOCNM81.pdf
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