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The first vertebrates to colonize terrestrial habitats, amphibians remain closely tied to water. Most return to water to reproduce, and they have moist scaleless skin, only rarely living in drier environments. Amphibians characteristically emerge from eggs as larval tadpoles, later undergoing metamorphosis to their adult forms.
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AxolotlThe salamander that never quite grew up. Learn why the axolotl is unique. |
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BullfrogMore often heard than seen the bullfrog can be remarkably hard to spot, despite its size. |
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Fire SalamanderA nocturnal animal, the fire salamander is territorial, usually returning to the same refuge during the day. |
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Hellbender SalamanderMudpuppy is just one of the unusual names by which this elusive amphibian is known. |
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Strawberry Poison Dart FrogJust one of the more than 200 species of poisonous frogs so far discovered. |
Nature picture credits (top to bottom): Photo © Stephen Dalton / Minden Pictures (Axolotl); © Robin Arnold (Bullfrog); © Anita Huszti (Fire Salamander); © Ron Goellner, St. Louis Zoo (Hellbender Salamander); © Steve Geer (Poison Dart Frog);