Estimated nightly detection probabilities (<i>P</i>) with standard error (<i>SE</i>) for male koala bellows relative to stage of the breeding season (early, mid- and late), sampling schedule, and koala population density (low: <1 koala/ha, and high: ≥1 koala/ha).

The number of nights required to be 80% and 95% confident of a site-specific absence of koalas is given.