House occupants are rarely aware of them but the introduced Rattus rattus (Roof or Black Rat) is ubiquitous in the suburbs and is clearly the dominant small mammal. House Mice (Mus musculus) are also seen. Native Rakali (Hydromys chrysogaster) occur along creek lines but generally not close to houses. When baited with anticoagulant toxins, Roof Rats become moribund and diurnal. At that time householders and neighbours may easily see them in the garden. When moribund, or as fresh carcasses, the poisonned rodents are a danger to predatory birds including owls because birds are sensitive to the 'second generation' anticoagulants such as Brodifacoum. Consequently, it has recently been decided by the APVMA (national regulatory body) to ban these from commercial sale to householders.