Habitat preferences for each mammal species were recorded during the assessment using a standardized list ( IUCN Habitats Classification Scheme ) of habitats. A summary of the most important habitats for terrestrial mammals is shown in Figure 11, and for freshwater and marine mammals in Figure 12.
For terrestrial mammals by far the most common habitat is forest. Shrublands and grasslands are the next most favoured habitats. Notably rocky areas and caves are quite common habitat preferences too, most notably for bats. The least favoured habitats are those that are dry and arid. Interestingly, almost 1,500 species are tolerant of some kind of disturbed habitats. This tolerance to disturbance does not necessarily guarantee a species will not be threatened; even though the impact of habitat loss may be lessened, many of these species are still being heavily impacted by utilization.
For marine species, the most common habitat is oceanic followed closely by intertidal. It is noteworthy that there are no marine mammals in the deep benthic marine zone.