The biologist E.O. Wilson estimates there are about 13 million species, broken down as follows:
Insects 9 million
Bacteria 1 million
Fungi 1 million
Viruses 0.3 million
Algae 0.3 million
Worms 0.3 million
Plants 0.2 million
Protozoa 0.2 million
Echinoderms 0.2 million
Mollusks 0.2 million
Crustaceans 0.2 million
Fish 30 thousand
Reptiles 10 thousand
Birds 10 thousand
Amphibians 5 thousand
Mammals 5 thousand
Via The New Shelton wet/dry
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