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E-book Sumatran Mamals : Photographs from Camera Traps in the Bukit Tigapuluh Landscape
A huge variety of terrestrial and aquatic species are included in this class, with over 5000 species recorded worldwide. All mammals share a basic feature: the presence of mammary glands that produce milk to feed their offspring. In contrast to birds, fish and reptiles, mammals have hair or fur. This may sometimes be barely visible or only present in newborn animals. Mammals also have a region of the brain called the neocortex and three middle ear bones. Mammals have comparatively large brains and most are quite intelligent.
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