Animals like frogs, salamanders, and newts that live part of their life in water and part on land.
From Greek 'amphi' (both) and 'bios' (life), literally 'double-life' creatures. Scientific term adopted in English by the 18th century.
Amphibians are considered the canary in the coal mine for environmental health—their permeable skin absorbs toxins, making them super-sensitive to pollution, so declining frog populations signal ecosystem trouble.
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