Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
   Cold      dry      feather      gills      hair      land      lungs      milk      moist      shell      slimy      Warm      water   

The characteristics of mammals are:-
* Warm-blooded.
* Give birth to young and produce for them.
* Body covered with .
* Breathe through .

The characteristics of reptiles are :-
* -blooded
* Lay eggs and scale
* Breathe through .

The characteristics of amphibians are :-
* Cold-blooded and skin
* Lay eggs
* Breathe through when young.
* Breathe through and skin at adult stage.
* Live both in and on .

The characteristics of bird are :-
* -blooded,Lay eggs with , have and breathe through .

The characteristics of fish are cold-blooded, lay eggs, scales, breathe through and live in .