Fifty-four species of mammals inhabit (or have recently inhabited) the Savannah River Site (SRS; Cothran et al. 1991; table 4.24). Although far fewer in number than other taxa (see the previous five sections of this chapter), the mammals of SRS represent a wide diversity of body sizez, life histories, habitat affinities, and food habits. They range in body size from approximately 5 g (0.2 oz; the least shrew; see table 4.24 for scientific names) to 200 kg (441 lbs; black bear). They feed on herbaceous material, acorns, mushrooms, insects, other invertebrates, and vertebrates. Various mammals on SRS use underground tunnels, semi-aquatic environments, terrestrial habits, and trees. They also employ a wide variety of locomotory modes, including burrowing, swimming, running, gliding, and flying.