Published online by Cambridge University Press: 05 June 2012
In bats . . . we perhaps see traces of an apparatus originally constructed for gliding through the air rather than for flight.
Darwin (1859, p. 181)Introduction
It is easy to grasp why bats are so successful: a small nocturnal mammal in possession of powered flight can explore resources in a relatively low-risk environment at spatial scales orders of magnitude larger than that of non-volant mammals of comparable size. As an example, the median home range of the 8–11 g vespertilionid Chalinolobus tuberculatus can be as large as 1500 ha (O'Donnell, 2001); this is the average area used, for instance, by a 300 kg herbivore, the Wapiti (Cervus elaphus canadensis; Calder, 1996). Acquisition of powered flight represented an immediate advantage to the bat lineage. As attested by the fossil record, bats reached nearly worldwide distribution early in their evolution. By the Early Eocene, bats suddenly appear in all the major landmasses they inhabit today (Gunnell and Simmons, 2005; Tejedor et al., 2005; Eiting and Gunnell, 2009). This suggests that powered flight may have played a key role in the fast expansion of bats, thereby contributing to their spectacular diversification.
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