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  1. Amphibian - Wikipedia

    Amphibians are ectothermic, anamniotic, four-limbed vertebrate animals that constitute the class Amphibia. In its broadest sense, it is a paraphyletic group encompassing all tetrapods, but …

  2. Amphibian | Characteristics, Life Cycle, & Facts | Britannica

    Nov 14, 2025 · amphibian, (class Amphibia), any member of the group of vertebrate animals characterized by their ability to exploit both aquatic and terrestrial habitats.

  3. Amphibians – Definition, Examples, Characteristics

    Mar 13, 2024 · Amphibians are ectothermic (cold-blooded) vertebrates that belong to the Class Amphibia. A defining characteristics is their ability to live both in aquatic and terrestrial …

  4. Amphibian Pictures & Facts | National Geographic

    Amphibians are small vertebrates that need water, or a moist environment, to survive. The species in this group include frogs, toads, salamanders, and newts. All can breathe and …

  5. Amphibian - Definition, Examples, Characteristics, and Life Cycle

    Jul 9, 2024 · The term ‘amphibian’ is derived from the Greek word ‘amphíbios,’ meaning ‘both kinds of life,’ referring to their ability to inhabit terrestrial and aquatic environments. About …

  6. Amphibian Fact | Definition, Characteristics, List of Types

    What is an amphibian - Learn about their characteristics, what habitat they live in, examples and list of amphibians with names and pictures

  7. Amphibians | U.S. Geological Survey - USGS.gov

    Feb 28, 2025 · More than 6,000 amphibian species exist worldwide, with approximately 300 of them found in the United States. In response to indications of declines of amphibian …