Mammalia is a class of animal within the phylum Chordata. Mammal classification has been through several iterations since Carl Linnaeus initially defined the class. No classification system is universally accepted; McKenna & Bell (1997) and Wilson & Reader (2005) provide useful recent compendiums. Many earlier ideas from Linnaeus et al. have been completely abandoned by modern taxonomists, among these are the idea that bats are related to birds or that humans represent a group outside of other living things. Competing ideas about the relationships of mammal orders do persist and are currently in development. Most significantly in recent years, cladistic thinking has led to an effort to ensure that all taxonomic designations represent monophyletic groups. The field has also seen a recent surge in interest and modification due to the results of molecular phylogenetics.
Threatened fauna of Australia are those species and subspecies of birds, fish, frogs, insects, mammals, molluscs, crustaceans, and reptiles to be found in Australia that are in danger of becoming extinct. This article lists species classified as threatened species under the Commonwealth Environment Protection and Biodiversity Conservation Act 1999.
The fauna of Toronto include a variety of different species situated within the city limits. Toronto contains a mosaic of ecosystems that includes forests, rivers, streams, and wetlands, which allows it to support a large variety of fauna. Approximately 87 to 90 per cent of the city's indigenous flora and fauna inhabit the city reside within the Toronto ravine system. The city's ravine system, creeks and rivers are wildlife corridors that allow animals to travel from one area of the city to another. Although most animals in Toronto reside within the ravine system, several animals also live in the city's urban environment and parks.
The fauna of Illinois include a wide variety of mammals, birds, amphibians, reptiles, fish and insects.
The fauna of the United States Virgin Islands consists of 144 species of birds, 22 species of mammals, 302 species of fish and 7 species of amphibians. The animals include numerous native species of tropical birds, fish, and land reptiles as well as sea mammals. The only native land mammals are six species of native bats: the greater bulldog bat, Antillean fruit-eating bat, red fruit bat, Brazilian free-tailed bat, velvety free-tailed bat and the Jamaican fruit bat. Some of the nonnative land mammals roaming the islands are the white-tailed deer, small Asian mongoose, goats, feral donkeys, rats, mice, sheep, hogs, dogs and cats.
Missouri is home to a diversity of flora, fauna and funga. There is a large amount of fresh water present due to the Mississippi River, Missouri River, and Lake of the Ozarks, with numerous smaller rivers, streams, and lakes. North of the Missouri River, the state is primarily rolling hills of the Great Plains, whereas south of the Missouri River, the state is dominated by the oak-hickory Central U.S. hardwood forest.
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