Victoria University conservation biologist Dr Stephen Hartley and colleague Asher Cook have released findings of research into birdsong in the Aorangi Forest before and after 1080 drops, with evidence that challenges assertions over the impact of 1080 drops.
This from the NZ Herald:
"Throughout the experiment, [before and after the 1080 drop] calling rates of 10 monitored bird species stayed constant, with the only notable variations being an increase in whitehead calls but a decline in tomtit calls."