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We define African savannahs as being those areas that receive between 300 and 1,500 mm of rain annually. This broad definition encompasses a variety of habitats. Thus defined, savannahs comprise 13.5 million km2 and encompass most of the present range of the African lion (Panthera leo). Dense human populations and extensive conversion of land to human use(More)
Packer et al. reported that fenced lion populations attain densities closer to carrying capacity than unfenced populations. However, fenced populations are often maintained above carrying capacity, and most are small. Many more lions are conserved per dollar invested in unfenced ecosystems, which avoid the ecological and economic costs of fencing.
Historical knowledge and recent surveys attest that lions are declining across parts of Africa (1, 2). We applaud Bauer et al. assembling available counts because they motivate better monitoring and conservation support. Their own data, however, reject their claims that lions are " declining everywhere, except in four southern countries " and that lions(More)
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