Key Characteristics:
* Vertebrates: Amphibians are part of the vertebrate family, meaning they have a backbone (spinal column).
* Ectothermic: They rely on external sources like the sun to regulate their body temperature. Unlike mammals and birds, they can't generate their own heat.
* Moist Skin: Amphibian skin is typically smooth and moist, often with glands that secrete mucus. This moist skin allows for gas exchange, meaning they breathe through their skin as well as their lungs.
* Metamorphosis: Most amphibians undergo a dramatic transformation called metamorphosis during their life cycle. They begin as aquatic larvae (like tadpoles) and then transform into land-dwelling adults. This change involves the development of limbs, lungs, and other features.
* Life Cycle Linked to Water: Although many adult amphibians are terrestrial, they are still dependent on water for their survival. They need water to lay their eggs and for the tadpoles to develop.
* Webbed Feet: Many amphibians have webbed feet, which helps them swim efficiently in water.
* Ears: Some amphibians have external eardrums, which they use to hear. Others have inner ear structures that help them sense vibrations.
Examples:
* Frogs and Toads: These are the most well-known amphibians, with a wide variety of species.
* Salamanders and Newts: These long, slender amphibians are often found in moist environments.
* Caecilians: These limbless, worm-like amphibians live in tropical climates.
Amphibians are often seen as a good indicator of the health of an ecosystem. They are sensitive to changes in their environment, such as pollution and habitat loss. If amphibians are struggling, it can be a sign that the ecosystem is in trouble.
