1 School of Biological Sciences and Department of Statistics, University of Auckland, Auckland 1142, New Zealand; Zero Invasive Predators, c/o Zealandia Sanctuary, PO Box 9267, Wellington 6141, New Zealand. Electronic address: [email protected].
2 Centre for Biodiversity & Environment Research, Department of Genetics, Evolution & Environment, University College London, Gower Street, London WC1E 6BT, United Kingdom; Institute of Zoology, ZSL, Regent's Park, London NW1 4RY, United Kingdom.