• amphibians are the first vertebrates to evolve from life in the sea to life on land.
  • There are about 6,200 known species of living amphibians.
  • They are classified into three orders: frogs and toads, salamanders and newts, and caecilians.
  • Caecilian are the only amphibians without legs and live in the water or soil.
  • They have a long, worm-like body without legs, and are adapted for walking and swimming rather than jumping.
  • Salamander and newt may walk or swim.
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