1: How does a chameleon change colour? 2: Why can't penguins fly? 3: Do dogs sweat? 4: Which is the most venomous animal? 5: Why are flamingos pink? 6: Which animal does the biggest poo? 7: How do snakes smell? 8: Which bird can fly backwards? 9: Which fish can turn itself inside out? 10: Why do animals lay eggs? 11: Which animal sleeps the most? 12: Can a cockroach live without its head? 13: Which animal has the strongest bite? 14: How do fireflies light up the night? 15: Which bird clocks up the most air miles? 16: Do all animals fart? 17: Which animal lives the longest? 18: Are dinosaurs still alive today? 19: Which animal is the best hunter? 20: Which animal has three hearts (and nine brains)? 21: Are pets cats really part tiger? 22: Glossary 23: Find out more 24: Index.