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The Encyclopedia of Life (EOL) is a free, online encyclopedia intended to document all of the 1.9 million living species known to science. It aggregates content to form "pages" for every known species. Content is compiled from existing trusted databases which are curated by experts and it calls on the assistance of non-experts throughout the world.
The word animal comes from the Latin noun animal of the same meaning, which is itself derived from Latin animalis 'having breath or soul'. [6] The biological definition includes all members of the kingdom Animalia. [7] In colloquial usage, the term animal is often used to refer only to nonhuman animals.
Biologists can study life at multiple levels of organization, [1] from the molecular biology of a cell to the anatomy and physiology of plants and animals, and the evolution of populations. [1] [6] Hence, there are multiple subdisciplines within biology, each defined by the nature of their research questions and the tools that they use.
Animal body lengths range from 8.5 μm (0.00033 in) to 33.6 m (110 ft). They have complex ecologies and interactions with each other and their environments, forming intricate food webs. The scientific study of animals is known as zoology, and the study of animal behaviour is known as ethology.
The following outline is provided as an overview of and topical guide to zoology: . Zoology – study of animals.Zoology, or "animal biology", is the branch of biology that relates to the animal kingdom, including the identification, structure, embryology, evolution, classification, habits, and distribution of all animals, both living and extinct, and how they interact with their ecosystems.
The encyclopedia of animals: A complete visual guide. University of California Press, 2004. ISBN 0520244060. [1] Burton, Maurice, Robert Burton. International wildlife encyclopedia. Marshall Cavendish, 2002. ISBN 0761472665. [1] Encyclopedia of Animal Behavior. Facts on File, 1987. [6] Encyclopedia of Animal Biology. Facts on File, 1987. [6]
Synthetic biology – research integrating biology and engineering; construction of biological functions not found in nature. Botany – study of plants. Economic botany – study of relationship between people and plants, including the practical uses of plants; Ethnobotany – study of a region's plants and their usage by people