Nearly one third of the world’s 6,300 known species of amphibians are threatened. In the last 20 years 168 species have gone extinct, and nearly 2500 species are suffering declining populations. The biggest reason for these populations declines is habitat destruction, along with the disease chytridiomycosis (see above answer) and climate change. Other factors include introduction of non-native species, removal for sale as pets and medicinal/biological uses, increasing UV-B radiation levels, and chemical pollution.
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