Research by Scheele et al into the global effect of Batrachoch­ytrium dendrobati­dis – chytrid fungus – on 501 frog species. Each bar represents a species; colours show the extent of population declines. The researcher­s say their decline estimates are conservati­ve for a number of reasons. They point to the large number of currently undescribe­d species in remote tropical ecosystems; their exclusion of species with documented declines but with no direct evidence linking that decline to chytrid; and a lack of data about many frogs’ full range.

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