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AMPHIBIANS

Amphibians are ectothermic or cold-blooded animals that metamorphose from a juvenile water breathing form, either to an adult air-breathing form, or to a paedomorph that retains some juvenile characteristics. Amphibians are ecological indicators, and in recent decades there has been a dramatic decline in amphibian populations around the globe. Many species are now threatened or extinct.

Amphibians - Frog

Types of Amphibians

Amphibians are basically charaterized into two types, here is the list of all its varieties:

Frogs and Toads

Salamanders

Ten Facts about Amphibians

  1. Nearly all amphibians live the first part of their lives in water and the second part on land and were the first animals with backbones to adapt to life on land.
  2. Amphibians live in many environments, including grasslands, rain forests, conifer forests, alpine areas, and even deserts, although most species require freshwater habitats such as ponds, swamps, streams, or other wet environments for breeding.
  3. Most adult amphibians retain their teeth, but in some species, teeth are reduced in size or not present at all.
  4. Amphibians are ectotherms, and generally spend part of their time on land, but most do not have the adaptations to an entirely terrestrial existence found in most other modern tetrapods (amniotes).
  5. Amphibians developed with the characteristics of pharyngeal slits/gills, a dorsal nerve cord, a notochord, and a post-anal tail at different stages of their life.
  6. Dramatic declines in amphibian populations, including population crashes and mass localized extinction, have been noted in the past two decades from locations all over the world, and amphibian declines are thus perceived as one of the most critical threats to global biodiversity.
  7. Amphibians are found in a variety of colors, from drab browns and grays to shocking reds and blues.
  8. Amphibians, and reptiles for that matter, are known to display a wide variety of color defects and abnormalities, such as leucism, melanism, and xanthism, which result in some rather remarkable phenotypes.
  9. Amphibians use body positioning to utilize such micro-habitats, basically positioning their bodies on surfaces in manners to either expose more of the body to the surface, or less.
  10. Amphibians -- frogs, toads, salamanders, newts and caecilians -- are vital members of a delicate ecosystem as well as important environmental indicators and contributors to human health and wellness.







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