Amphibians are among the most sensitive vertebrates on Earth – and among the most endangered. As early warning systems for the health of freshwater bodies and entire ecosystems, they respond particularly quickly to environmental change. According to the IUCN, 41% of all amphibian species worldwide are already considered threatened. A
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Craugastor punctariolus has been listed as Critically Endangered (Possibly Extinct) since 2019. Endemic to Panama, the species was last seen in 2010; chytrid fungus and habitat loss have (almost) wiped out its populations. (© Brian Gratwicke, CC BY 2.0, via Wikimedia Commons)

