In Australia some housing estates put restrictions on what people can do to protect koalas. They can't own dogs or cats for example and the Koala's needs are paramount. But how many people are prepared to give up lifestyle choices so that wildlife can thrive? Or are the needs and rights of people greater than those of species under threat? Monty Don explores whether people are prepared to forgo personal choice for wildlife in a world where human population is increasingly putting pressure on many species.