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Over 1.5 million living animal species have been described—of which around 1 million are insects—but it has been estimated there are over 7 million in total. Animals range in size from 8.5 millionths of a metre to 33.6 metres (110 ft) long and have complex interactions with each other and their environments, forming intricate food webs.
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.
The following table lists estimated numbers of described extant species for the animal groups with the largest numbers of species, [1] along with their principal habitats (terrestrial, fresh water, [2] and marine), [3] and free-living or parasitic ways of life. [4]
We tend to think of mammals as the only animals on earth with the capacity for deep thought. For example, chimpanzees form long-term memories and complex social relationships. Dogs can learn as ...
Get a daily dose of cute photos of animals like cats, dogs, and more along with animal related news stories for your daily life from AOL.
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.
Animals communicate through sounds and body language. Many of their expressions are difficult for their human owners to decipher. One difficult-to-decipher expression is the famous cat stare.
Animals are a major group of organisms, classified as the kingdom Animalia. This category includes animals, their study , and their classification . Subcategories