One of the best, if not the best, websites I have seen for a long time
This activity is based around a series of questions relating to the suitability of particular habitats for animals. While it can be used in a pure quiz style, its chief aim is to encourage children to explore the information available on the animal and the habitat for each question, and then make a decision based on that research.
Many of the questions can be used to provide opportunities for class or group discussion based on the suitability of environments and how animals are adapted to fit these environments. Debate and discussion around the possible answers should be encouraged.