Where are frogs and toads most diverse in the world?

Frogs and toads are most diverse and abundant in humid tropical environments, particularly within rainforests.12

While these amphibians are widely distributed across the globe—inhabiting regions from below sea level to high-altitude montane areas—their species richness is significantly higher in the tropics compared to temperate zones. For instance, a single locality in the upper Amazon basin can host as many species as are found throughout the entire United States. This high level of diversity is supported by the complex structure of tropical ecosystems, which allows species to partition resources through spatial and temporal separation in breeding and activity patterns.1