Supplementary Table S1: Australian terrestrial mammal species assessed as more susceptible to predation from savannah cats than domestic cats. We assume that any mammal species assessed as at risk of predation by the domestic cat will be at least as susceptible to predation by the savannah cat (SC). Only those mammal species assessed as more susceptible to predation by savannah cats than by domestic cats are listed here. The full list of all mammal species assessed is provided in Table S1 of Radford et al. 2018 [53]. Female body weight data are mostly from Van Dyck and Strahan 2008 [62], with data on species described since 2008 obtained from the primary sources. Female Susceptibility Conservation Susceptibility Body to Domestic Species Common Name Status (IUCN) to Savannah Reason for Change Weight Cat Predation [46] Cat Predation (g) * Ornithorhynchus Not Occupies riparian areas, Platypus 600–1700 NT High anatinus susceptible dense vegetation Weight range places it at high potential Zaglossus Western long- Not ~5000 CR Low susceptibility to SC bruijnii beaked echidna susceptible predation, but spines provide some protection Dasyurus Spotted-tailed Partly arboreal, occupies 900–2500 NT Low High maculatus Quoll dense wet forests Weight range places it at high potential Sarcophilus Not susceptibility to SC Tasmanian devil 5000–9000 EN Low harrisii susceptible predation, but pugnacious behaviour reduces risk to low Occupies rainforest, Antechinus Not Rusty antechinus 18–35 LC Low some activity high above adustus susceptible ground Occupies rainforest, Antechinus Atherton Not 42–78 NT Low some activity high above godmani antechinus susceptible ground Occupies rainforest, Cinnamon Not Antechinus leo 32–74 LC Low some activity high above antechinus susceptible ground Occupies rainforest, Antechinus Buff-footed Not 18–34 LC Low some activity likely to be mysticus antechinus susceptible high above ground Occupies rainforest, Antechinus Subtropical Not 16–32 LC Low some activity high above subtropicus antechinus susceptible ground Weight range places it Myrmecobius at high potential Numbat 305–647 EN Low High fasciatus susceptibility to SC predation Occupies rainforest, weight range places it at Echymipera Long-nosed 300–1200 LC Low High high potential rufescens echymipera susceptibility to SC predation Often occupies dense vegetation, weight range Isoodon Northern brown 500–1700 LC Low High places it at high macrourus bandicoot potential susceptibility to SC predation Southern brown Often occupies dense Isoodon obesulus 400–1200 NT Low High bandicoot vegetation, weight range places it at high potential susceptibility to SC predation Often occupies dense vegetation, weight range Isoodon Quenda 400–1100 LC Low High places it at high fusciventer potential susceptibility to SC predation Often occupies dense vegetation, weight range Isoodon Cape York 350–1050 LC Low High places it at high peninsulae brown bandicoot potential susceptibility to SC predation Often occupies dense vegetation, weight range Perameles Northern long- 350–950 LC Low High places it at high pallescens nosed bandicoot potential susceptibility to SC predation Weight range places it at Phascolarctos 7000– Not some risk to SC Koala VU Low cinereus 11,000 susceptible predation, mostly active high above ground Dactylopsila Occupies rainforest, Striped possum 310–475 LC Low High trivirgata often active near ground Not Usually active > 4 m Petaurus gracilis Mahogany glider 310–454 EN Low susceptible above ground Petropseudes Rock ringtail Much activity in trees < 1280–2000 LC Low High dahli possum 4 m above ground Often active on ground in dense forest, weight Trichosurus Short-eared 2500–4500 LC Low High range places it at high caninus brushtail possum potential susceptibility to SC predation Often active on ground in dense forest, weight Trichosurus Mountain 2600–4200 LC Low High range places it at high cunninghami brushtail possum potential susceptibility to SC predation Often active on ground in dense forest, weight Trichosurus Common 1200–3500 LC Low High range places it at high vulpecula brushtail possum potential susceptibility to SC predation Wyulda Scaly-tailed Much activity in trees < 900–2000 NT Low High squamicaudata possum 4 m above ground Occupies rainforest, weight range places it at Hypsiprymnodon Musky rat- 453–635 LC Low High high potential moschatus kangaroo susceptibility to SC predation Part of range overlaps dense forest, weight Aepyprymnus Rufous bettong 1300–3000 LC Low High range places it at high rufescens potential susceptibility to SC predation Part of range overlaps dense forest, weight Bettongia Eastern bettong 1200–2250 NT Low High range places it at high gaimardi potential susceptibility to SC predation Occupies rainforest, Dendrolagus Bennett's tree- 6300– Not NT Low mostly active > 4 m bennettianus kangaroo 10,600 susceptible above ground Occupies rainforest, Dendrolagus Lumholtzi's tree- Not 5100–7750 NT Low mostly active > 4 m lumholtzi kangaroo susceptible above ground Weight range places it Lagorchestes Spectacled hare- at high potential 1600–4750 LC Low High conspicillatus wallaby susceptibility to SC predation Weight range places it Notamacropus 9000– Not at low potential Agile wallaby LC Low agilis 15,000 susceptible susceptibility to SC predation Weight range places it Notamacropus Black-striped Not at high potential 5200–7600 LC High dorsalis wallaby susceptible susceptibility to SC predation Weight range places it Notamacropus at high potential Tammar wallaby 4000–6000 LC Low High eugenii susceptibility to SC predation Weight range places it at intermediate potential susceptibility to SC Notamacropus Western brush 7000–9000 LC Low High predation, high risk irma wallaby associated with occupation of wet flats and thickets Weight range places it Notamacropus Not at high potential Parma wallaby 3200–4800 NT High parma susceptible susceptibility to SC predation Weight range places it Notamacropus 7000– Not mostly at low potential Whiptail wallaby LC Low parryi 15,000 susceptible susceptibility to SC predation Weight range places it Notamacropus Red-necked 11,000– Not at low potential LC Low rufogriseus wallaby 15,500 susceptible susceptibility to SC predation Weight range places it Osphranter Not at low potential Black wallaroo 13,000 NT Low bernardus susceptible susceptibility to SC predation Weight range places it Onychogalea Bridled nailtail at high potential 4000–6000 EN Low High fraenata wallaby susceptibility to SC predation Weight range places it Onychogalea Northern nailtail at high potential 4500–7000 LC Low High unguifera wallaby susceptibility to SC predation Weight range places it at high potential Herbert's rock- Not susceptibility to SC Petrogale herberti 3700–4900 LC Low wallaby susceptible predation, but its rock outcrop habitat likely reduces risk to low Weight range places it at high potential Petrogale Unadorned rock- Not susceptibility to SC 3100–5000 LC Low inornata wallaby susceptible predation, but its rock outcrop habitat likely reduces risk to low Petrogale Proserpine rock- 3500–8100 EN Not Low Weight range places it persephone wallaby susceptible at high potential susceptibility to SC predation, but its rock outcrop habitat likely reduces risk to low Weight range places it at high potential Petrogale Purple-necked Not susceptibility to SC 2700–5700 NT Low purpureicollis rock-wallaby susceptible predation, but its rock outcrop habitat likely reduces risk to low Occupies rainforest / wet forest with dense understorey, weight Thylogale Tasmanian 2400– LC Low High range places it mostly at billardierii pademelon 10,000 high potential susceptibility to SC predation Occupies rainforest / wet forest with dense Thylogale Red-legged understorey, weight 2500–4200 LC Low High stigmatica pademelon range places it at high potential susceptibility to SC predation Occupies rainforest / wet forest with dense Red-necked understorey, weight Thylogale thetis 1800–4300 LC Low High pademelon range places it at high potential susceptibility to SC predation Mostly confined on mainland to dense vegetation in high Setonix Quokka 1600–3500 VU Low High rainfall areas, weight brachyurus range places it at high potential susceptibility to SC predation Weight range places it 10,300– Not at low potential Wallabia bicolor Swamp wallaby LC Low 15,400 susceptible susceptibility to SC predation Mastacomys Broad-toothed Occupies dense wet, 97–145 NT Low High fuscus rat often riparian habitats Pseudomys Western chestnut Occupies varied habitats 18–56 LC Low High nanus mouse with dense understorey Occupies riparian areas, Hydromys Water-rat 340 – 992 LC Low High often with dense chrysogaster vegetation Occupies coastal and Xeromys myoides Water mouse 32–64 VU Low High riparian areas, often with dense vegetation Occupies dense vegetation in high Grassland Melomys burtoni 26–97 LC Low High rainfall coastal areas, melomys much activity < 4 m above ground Occupies rainforest and Melomys Cape York Not other wet forest, much 45–96 LC High capensis melomys susceptible activity < 4 m above ground Occupies dense Melomys Fawn-footed Not 45–120 LC High vegetation in high cervinipes melomys susceptible rainfall coastal areas, much activity < 4 m above ground Occupies rainforest and Uromys Giant white- Not other wet forest, much 500–800 LC High caudimaculatus tailed rat susceptible activity < 4 m above ground Occupies rainforest, Uromys Pygmy white- Not 152–220 NT High much activity likely to hadrourus tailed rat susceptible be < 4 m above ground Occupies