Possums love leaves packed with protein, an insight that could aid New Zealand's pest-control efforts.
Researchers from the Australian National University have just reported their findings in the international journal PLOS ONE, following a collaborative, Government-funded study with Landcare Research.
Each year, the Department of Conservation spends millions of dollars on 1080 poison and ground operations to combat possums which, in some forests have eaten whole canopies of rata, totara, titoki, kowhai and kohekohe.
They compete with native birds for habitats and food, disturb nesting birds, eat their eggs and chicks, and may also have an impact on native land snails.
Dr Hannah Windley from the ANU Research School of Biology compared the nutritional quality of New Zealand foliage with the damage possums do to trees by over-eating.