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Over 1.5 million living animal species have been described, of which around 1.05 million are insects, over 85,000 are molluscs, and around 65,000 are vertebrates. It has been estimated there are as many as 7.77 million animal species on Earth. Animal body lengths range from 8.5 μm (0.00033 in) to 33.6 m (110 ft).
- Kingdoms
In biology, a kingdom is the second highest taxonomic rank,...
- Bilateria
Bilateria (/ ˌ b aɪ l ə ˈ t ɪər i ə /) is a large clade or...
- Animal (Disambiguation)
An animal is a multicellular, eukaryotic organism of the...
- Animalia (Disambiguation)
Animalia is the taxonomic kingdom comprising all animals....
- Tardigrada
Tardigrades (/ ˈ t ɑːr d ɪ ɡ r eɪ d z /), known colloquially...
- Arthropoda
Arthropods (/ ˈ ɑːr θ r ə p ɒ d /) are invertebrates in the...
- List of Animal Classes
The following is a list of the classes in each phylum of the...
- Kingdoms
- Grouping Animals
- Life Styles
- Everyday Language
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There are many different types of animals. The common animals most people know are only about 3% of the animal kingdom. When biologists look at animals, they find things that certain animals have in common. They use this to group the animals in a biological classification. Several million species may exist, but biologists have only identified about...
The animal mode of nutrition is called heterotrophic because they get their food from other living organisms. Some animals eat only plants; they are called herbivores. Other animals eat only meat and are called carnivores. Animals that eat both plants and meat are called omnivores. Some animals get their energy from photosynthetic protiststhat live...
In scientific usage, humans are animals. But in everyday use, humans are often not regarded as animals.
Ethology, the study of animal behaviourEntoprocta / ɛntoʊˈprɒktə / ( lit. 'inside rectum/anus'), or Kamptozoa / kæm ( p) təˈzoʊə /, is a phylum of mostly sessile aquatic animals, ranging from 0.1 to 7 millimetres (0.004 to 0.3 in) long. Mature individuals are goblet -shaped, on relatively long stalks. They have a "crown" of solid tentacles whose cilia generate water ...
Mar 26, 2024 · Learn about animal, any of a group of multicellular eukaryotic organisms that evolved from unicellular eukaryotes and have muscles and mobility. Explore the diversity, evolution, and behaviour of animals with Britannica.
All members of Animalia are multicellular, and all are heterotrophs (that is, they rely directly or indirectly on other organisms for their nourishment). Most ingest food and digest it in an internal cavity. Animal cells lack the rigid cell walls that characterize plant cells. The bodies of ...
