mammal
A mammal is a kind of warm-blooded vertebrate with lungs breathing in the subterminal mammary gland (Latin: Mammalia), named after feeding the milk through breast milk. According to the data of the "Mammal Species of the World" in 2005, there were about 5676 species (5888 IUCN Redbooks for the 2008 version) of the mammals, distributed in 1229 genera, 153 Section and 29 eyes, accounting for about 10% of the chordate gates, 0.4% of all the earth's species. Rodents (mice, porcupines, beavers, dolphins, etc.), winged hands (bats, etc.) and shrews (shrews, etc.) are the most species in mammals. Mammalian body structure is complex, different from other groups of brain structure, thermostatic system and circulatory system, with the offspring breastfeeding, most of the viviparous, with hair follicles and sweat glands and other common external features. They are of a variety of small, small body length of 30 mm long wings of the concave bats, up to 33 meters in length with the fish blue whales. They have good environmental adaptability, distributed from the ocean to the mountains, from the tropics to the polar regions. Humans are also members of mammals. ...