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The Best Estimate. Mathematician, computer science expert and animal rights advocate Brian Tomasik has attempted to catalog estimates of the number of individual animals in a variety of groupings. According to his data, the total number of individual animals on the earth adds up to approximately 20,000,121,091,000,000,000. This can be written as 20 quintillion, or 20 billion billion. Nature: Number of species on Earth tagged at 8.7 million.
Of all invertebrates, the insects are by far the most numerous. There are so many species of insects that scientists have yet to discover them all, let alone name or count them. Estimates of the total number of insect fall in the range of 1 to 30 million. The vertebrates represent the remaining 3% of all species and include species that are the most familiar to us: amphibians, reptiles, birds, fishes, mammals. The list below provides estimates of the number of species within various groups of animals.