Proceedings of 46th New Zealand Plant Protection Society Conference : 297 - 301 Invasive pest mammals are a serious threat to endemic invertebrates in New Zealand , where around 90 per cent of spiders and insects are endemic and evolved without predatory mammals .
Proceedings of 46th New Zealand Plant Protection Society Conference : 297 - 301 There is evidence that 1080 aerial operations in New Zealand may benefit invertebrate species . 
 Both possums and rats are a serious threat to endemic invertebrates in New Zealand , where around 90 per cent of spiders and insects are endemic and evolved without predatory mammals .