what are the different types of animals
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Wild animals
Domestic animals
Carnivores
Herbivores
Omnivores
Domestic animals
Carnivores
Herbivores
Omnivores
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Animals—complex, multicellular organisms equipped with nervous systems and the ability to pursue or capture their food—can be divided into six broad categories. In this article, you'll discover the six main animal groups, ranging from the simplest (invertebrates) to the most complex (mammals).
The first animals to evolve, as far back as a billion years ago, invertebrates are characterized by their lack of backbones and internal skeletons, as well as their relatively simple anatomy and behavior, at least as compared to most vertebrates.
The first true vertebrates on earth, fish evolved from invertebrate ancestors about 500 million years ago, and have dominated the world's oceans, lakes, and rivers ever since.
When the first amphibians evolved from their tetrapod ancestors, 400 million years ago, they quickly became the dominant vertebrates on earth.
Reptiles, like amphibians, make up a fairly small proportion of terrestrial animals—but in the form of dinosaurs, they ruled the earth for over 150 million years.
Birds evolved from dinosaurs—not once, but probably multiple times—during the Mesozoic Era, and today they are by far the most prolific flying vertebrates, numbering about 10,000 species spread across 30 separate orders.
It's natural for people to consider mammals the pinnacle of evolution--after all, humans are mammals, and so were our ancestors. (In fact, mammals are among the least diverse animal groups—there are only about 5,000 species overall!)
The first animals to evolve, as far back as a billion years ago, invertebrates are characterized by their lack of backbones and internal skeletons, as well as their relatively simple anatomy and behavior, at least as compared to most vertebrates.
The first true vertebrates on earth, fish evolved from invertebrate ancestors about 500 million years ago, and have dominated the world's oceans, lakes, and rivers ever since.
When the first amphibians evolved from their tetrapod ancestors, 400 million years ago, they quickly became the dominant vertebrates on earth.
Reptiles, like amphibians, make up a fairly small proportion of terrestrial animals—but in the form of dinosaurs, they ruled the earth for over 150 million years.
Birds evolved from dinosaurs—not once, but probably multiple times—during the Mesozoic Era, and today they are by far the most prolific flying vertebrates, numbering about 10,000 species spread across 30 separate orders.
It's natural for people to consider mammals the pinnacle of evolution--after all, humans are mammals, and so were our ancestors. (In fact, mammals are among the least diverse animal groups—there are only about 5,000 species overall!)
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