If you look closely, you can see a parrotfish

The Great Barrier Reef is the only living organic collective visible from Earth's orbit. The reef lies off the east coast of Australia and is one of the wonders of the natural world - it is the world's largest coral reef ecosystem. It was declared a World Heritage area in 1981. The reef covers more than 300,000 square kilometres consisting of more than 3000 reefs which range in size from 1 hectare to over 10,000 hectares in area. The length of the reef is over 2000km, ranging from above Cape York on the most north eastern point of Australia, down to below Gladstone.