Population density estimates of brushtail possums (Trichosurus vulpecula) in dry grassland in New Zealand

The introduced brushtail possum (Trichosurus vulpecula) is the most important wildlife host of bovine tuberculosis in New Zealand and is considered to be a major environmental and agricultural pest. Dry grassland ecosystems in New Zealand include some of the least protected and most threatened native biota. Drylands cover 19% of the country, but there is little published information on the population density of invasive brushtail possums in these environments, and previous estimates are not based on quantitative methods.