1. Bloodworm Pond or Polluted river It has haemoglobin to help it absorb oxygen just like our blood cells.

2. Water Flea Pond Antennae flick down to stop it sinking. Legs circulate water over its gills.

3. Butterfly Fish Sea Its markings help it escape predators.

4. Stonefly Nymph Fast-flowing river Flat body and claws help it cling to rocks.

5. Octopus Sea Eight tentacles with suckers grab food and rocks.

6. Perch River Fins help it move through water towards its prey.

7. Potamogeton Pond Flat leaves float on the surface to get light.

8. Water Crowfoot Fast flowing river Thin leaves let the water through without dragging them away.

9. Barnacles Sea Its shuts tight when the tide goes out. It is glued to the rock so waves don’t pull it off.

10. Tapegrass Fast flowing river Long, thin leaves let the water flow past them.

11. Skater Pond Special hairs on its feet stop it from sinking through the surface.

12. Water Boatman Pond Legs act like oars to move it quickly to catch its prey.

13. Shark Sea Streamlined body means it moves fast to catch its prey.

14. Bladder Wrack Sea Air bladders help it float to get light. Stalks are glued to rocks so waves don’t pull it off.