Animals can be classified into different groups based on various characteristics. The main classifications of animals are:
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Vertebrates: Animals with a backbone, including mammals, birds, reptiles, amphibians, and fish.
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Invertebrates: Animals without a backbone, including insects, arachnids, mollusks, annelids, and cnidarians.
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Warm-blooded (endothermic): Animals that can regulate their body temperature internally, such as mammals and birds.
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Cold-blooded (ectothermic): Animals that rely on external sources to regulate their body temperature, such as reptiles, amphibians, and fish.
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Herbivores: Animals that primarily eat plants and vegetation.
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Carnivores: Animals that primarily eat other animals.
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Omnivores: Animals that eat both plants and animals.
These are some of the main classifications of animals based on their characteristics.