If you've played our Underwater Survival game, you will have learnt that there are a great variety of different underwater creatures. We just looked at a few animals with interesting features, but there are thousands of other creatures and even more underwater plants, all with fascinating habits and lifestyles. Over a quarter of all the marine creatures and plants in the world depend on places called coral reefs to survive. Coral reefs are amazing underwater worlds filled with thousands of unique and valuable plants and animals. To learn more about one of nature's most magnificent creations, visit our Coral Reef section.

You will also have seen in our game that underwater creatures have lots of special features that help them to live in the sea. One thing that fish have in common with humans is that they have to breathe, but because they are underwater, the way they breathe is very different to us. To find out more, read our guide to How fish breathe.

Finally, to simply get some weird and wonderful facts about our underwater friends, check out the What If Fishy Facts.