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Paide chicks are highly vulnerable to predators because their nestling development period is approximately twice as long as that of continen- tal songbirds. In order to track the movements of feral cats in endangered paldaterri- tory, cats were trapped and fitted with radio collars before release back to the wild. their exposure to predators dramatically. In addition, many Hawaiian birds exhibit little fear of potential predators and often lack avoidance behaviors. Telemetry Radio transmitters were attached to a sample of cats captured on Mauna Kea in order to describe their home ranges, move - meats and activity patterns. On Mauna Kea, some male cats can range up to 20 km2 (8 mi') and this rivals the largest reported home range for a feral cat from anywhere in the world. In contrast, the home ranges of three females averaged less than 8 km' (3 min). The significance of these large home ranges and daily movements is that cats coyeted etedeao�Geobevom� threaten ae NasatdbV a °ac ateeolt nesting birds jhrs Pslitee0 �t\off\� dao9 s b �s eb from great distances. In ob�cKs data addition, several cats may hunt ba o optt+°p°Q in the same area, exposing birds to threats from a host of different cats over a short period of time. In the case of palila occupying only about 140 km' (54 mil), the home range of each male cat represents more than 10% of this area. Cats are most active at night, when birds have settled on their nests and are particularly vulnerable. Stomach contents from feral cats captured at two sites were examined in order to characterize the diet of these introduced predators (Figure 1). Feral cats on Mauna Kea subsist to a great extent on invertebrates and birds, including both songbirds The home ranges of a male lorange) and a female (blue) feral cat within the critical habitat of the endangered palila (red lines) on the West Slope of Mauna Kea. The home range of the male was 20.1 km', and the home range of the female was 6.1 km'. Smaller shapes inside the home ranges are areas that the cats used more intensively.