Fish Fish are vertebrates This means they have backbones Amphibians reptiles birds and mammals are vertebrates too Fish differ in many ways from the other groups Fish have fins they live in water and they usually have scales Almost all species of fish breathe through gills instead of lungs Fish are cold-blooded as are reptiles and amphibians This means their body temperature is close to that of the water around them 4 Shape fins and scales help identify fish
Fish Habits Most fish are active swimmers They swim to find food hiding places and places to lay their eggs Some fish make long journeys Pacific salmon travel from the sea They go back to lay eggs in the freshwater rivers where they were born Other fish swim only short distances Did You Know Many fish species live in large groups known as schools Others live by themselves 6 A large school of snappers searches for food
