The world of amphibians
          
        
        
          The most poisonous frog is the bright-yellow poison-dart frog.
        
        
          
            139
          
        
        
          
            A choice of home
          
        
        
          Frogs and toads can
        
        
          live both on land
        
        
          and in water.
        
        
          Some even
        
        
          live in trees.
        
        
          
            Water living
          
        
        
          Some salamanders
        
        
          spend the whole of
        
        
          their lives underwater.
        
        
          This cave salamander does not
        
        
          have any lungs; it breathes through its
        
        
          skin only. It is almost completely blind.
        
        
          
            Caecilians
          
        
        
          Legless caecilians are rarely seen by
        
        
          humans because they live either under
        
        
          water or under ground. They have a
        
        
          pointed head, which they use as a shovel.
        
        
          
            Travelling parents
          
        
        
          Each spring salamanders,
        
        
          newts, frogs, and toads
        
        
          lay their eggs in ponds
        
        
          or streams. Some travel
        
        
          5 km (3 miles) to get there.
        
        
          Land frogs tend to
        
        
          be more rounded
        
        
          in shape than
        
        
          water frogs.
        
        
          If an animal is poisonous like this tomato frog, it
        
        
          is often a very bright colour that warns predators.
        
        
          .
        
        
          .
        
        
          .
        
        
          o
        
        
          t
        
        
          h
        
        
          e
        
        
          r
        
        
          f
        
        
          r
        
        
          o
        
        
          g
        
        
          s
        
        
          p
        
        
          r
        
        
          e
        
        
          f
        
        
          e
        
        
          r
        
        
          t
        
        
          o
        
        
          l
        
        
          i
        
        
          v
        
        
          e
        
        
          i
        
        
          n
        
        
          t
        
        
          h
        
        
          e
        
        
          t
        
        
          o
        
        
          p
        
        
          s
        
        
          o
        
        
          f
        
        
          t
        
        
          a
        
        
          l
        
        
          l
        
        
          tr
        
        
          e
        
        
          e
        
        
          s
        
        
          !
        
        
          
            Common
          
        
        
          
            newt