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Mammals (class Mammalia) are vertebrate animals characterized by the presence of sweat glands, including milk producing sweat glands, and by the presence of: hair, three middle ear bones used in hearing, and a neocortex region in the brain. Also all mammals, other than the monotremes, give birth to live young instead of laying eggs. Most mammals also possess specialized teeth and use a placenta in the ontogeny. The mammalian brain regulates endothermic and circulatory systems, including a four-chambered heart. Mammals encompass approximately 5,400 species, ranging in size from the Bumblebee Bat, (30-40mm), to the Blue Whale, (33,000mm), distributed in about 1,200 genera, 153 families, and 29 orders,[1] though this varies by classification scheme. (Wikipedia, 2008)
Insects (Class Insecta) are a major group of arthropods and the most diverse group of animals on the Earth, with over a million described species, more than half of all known living organisms with published estimates of......

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