Reported V. salvator home ranges have varied from15-150 ha depending on population location and source(Gaulke et al., 1999; Auliya, 2003). With a total area of600 hectares, it is possible that Tinjil Island supportsseveral V. salvator populations with different homeranges. If so, monitors with home ranges encompassingareas lacking regular human presence may not behabituated to human activity. As a result, such individualsmay react differently upon encountering humans thanthose who have become accustomed to functioningaround human activity. It is also possible that monitorsdo in fact have large home ranges that overlap inhabitedas well as uninhabited areas, but that expectationsregarding presence or absence of human activity resultin a variety of reactions depending on the location of themonitor-human encounter.