Brazil holds about 10-15% of all species known to science. Iceland holds nearly none.
How to Play: Guess if the country on the right has MORE or FEWER known species than the one on the left.
Name A
Name B
Top 10 Most Biodiverse Countries
Biodiversity is concentrated near the equator. Tropical rainforest countries dominate species counts; cold and arid countries have far fewer.
| # | Name | Known Species (vertebrates + plants) | Unit |
|---|---|---|---|
| 1 | Brazil | 103,000 | species |
| 2 | Colombia | 70,000 | species |
| 3 | Indonesia | 67,000 | species |
| 4 | Mexico | 65,000 | species |
| 5 | China | 60,000 | species |
| 6 | Peru | 50,000 | species |
| 7 | DR Congo | 50,000 | species |
| 8 | United States | 50,000 | species |
| 9 | Ecuador | 45,000 | species |
| 10 | India | 45,000 | species |
Why the Tropics Are So Biodiverse
Total species counts in this game include known vertebrates and vascular plants. Insects and microbes are not counted — including them would multiply the numbers 10-100x.
The tropics hold the most biodiversity for several reasons: more solar energy supports more biomass, longer evolutionary history without ice-age disruption, and complex three-dimensional rainforest structure creating many niches.
Brazil’s leading position reflects the Amazon Basin (~10% of all known species) plus diverse other ecosystems (Cerrado savanna, Atlantic Forest, Pantanal wetlands). The exact total is uncertain — new species are described every year.
Frequently Asked Questions
Which country has the most biodiversity?
Brazil, by a wide margin — approximately 103,000 known species of vertebrates and plants, plus untold insects.
Why is Iceland so low?
Cold climate, recent volcanic origin, isolation, and limited time since the last ice age (~10,000 years) limit species count.
Are these counts accurate?
Approximate. New species are described regularly, especially insects and microbes. Vertebrate counts are most stable.
What is a 'megadiverse country'?
An informal term for the 17 countries holding 70%+ of biodiversity: Brazil, Colombia, China, Mexico, Indonesia, etc.
Note: Approximate counts of known vertebrate and plant species per Conservation International and CBD data.
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