Earth is a planet full of life. It is inhabited by approximately 11 million species, of which approximately 1.9 million have been described so far.

Below you will find a short list of the most important organisms along with the approximate number of species described.

• Mammals – about 5,500 species
• Birds – approximately 9,900 species
• Reptiles – about 8,700 species
• Amphibians – about 6,500 species
• Fish – approximately 31,100 species
• Invertebrates – approximately 1,360,000 species
• Plants – approximately 310,000 species
• Mushrooms – approximately 99,000 species