Top 100 Countries by Mammal Species Richness, 2026

How to read mammal species richness

Species richness is a concentration measure. It shows where the number of recorded mammal species is especially high, but it does not say whether those species are common, rare, increasing, declining or adequately protected. A country can rank high because it hosts many species and still face severe habitat loss or hunting pressure.

The upper tier is not simply a list of the largest countries. Brazil, China and the United States benefit from vast territory, but Ecuador reaches the top ten despite its much smaller area because the Andes-to-Amazon gradient creates intense ecological turnover. Indonesia leads because island geography, tropical forests, mountain systems and high endemism combine inside a very large archipelago.

Top 10 countries by mammal species richness

The top ten are dominated by the tropics and by countries spanning more than one major ecological system. Southeast Asia, the Amazon-Andes corridor, Central America, the Congo Basin and large continental transition zones all appear near the top.

Equal or near-equal totals should be interpreted within the limits of taxonomy and country-occurrence coding. The values are integer species counts from the selected MDD release.

Methodology

Mammal species richness is calculated as the count of living wild mammal species recorded for a country in the selected Mammal Diversity Database release. The ranking is sorted from the highest to the lowest country total.

The dataset is taxonomic rather than demographic. It does not estimate how many animals live in a country, how stable populations are, or whether habitats are protected. Domesticated species, widespread species treated outside the country-count table and recently extinct species are not counted as part of the living wild species total used for the ranking.

Comparability depends on accepted taxonomy, distribution coding and country boundaries. Species splits can raise totals, lumping can lower them, and range updates can move a species into or out of a country count. Marine mammals, bats and other wide-ranging species require particular care because their distributions often cross many borders and ecological zones.

Full ranking: 100 countries by mammal species richness

The table ranks 100 sovereign states by the number of living wild mammal species recorded in MDD v2.4. Use the search and filters to compare countries by region while keeping the original richness rank visible.

Source: ASM Mammal Diversity Database country table, version 2.4, released January 2, 2026. Regions are used only for navigation and do not affect the rank.

What the ranking shows

In the middle of the Top 100, African countries are especially visible. Kenya, Tanzania, Cameroon, Uganda, Angola, South Africa, Ethiopia and Nigeria combine savanna, forest, montane and dryland mammal assemblages. Their positions reflect both broad habitat variety and long-recognised faunal richness across sub-Saharan Africa.

The lower part of the Top 100 includes colder, drier or smaller countries where mammal diversity is still significant but less concentrated than in the tropical leaders. European countries enter the list mainly through broad continental faunas, Mediterranean diversity or overseas-influenced national boundaries, while many small island states fall outside the Top 100 because their native terrestrial mammal lists are narrower.

What mammal richness means for readers

For conservation policy, the ranking points to countries where land-use decisions can affect a large share of global mammal diversity. Forest conversion, road building, mining, hunting pressure and protected-area design matter everywhere, but the stakes are especially high where hundreds of species overlap.

For analysts and ESG teams, richness is a biodiversity exposure signal rather than a risk score. It should be compared with endemism, threatened-species counts, habitat loss, protected-area coverage and project-level ecological assessments before drawing conclusions about conservation urgency or business risk.

For students, educators and nature-focused travellers, the table helps explain why the Amazon, Andes, Congo Basin, Southeast Asian archipelagos and Mesoamerica are repeatedly described as global mammal-diversity centres. High richness does not guarantee easy wildlife observation, but it does identify places where mammal lineages are exceptionally concentrated.

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