Unit 5 A delicate world

¡¡¡¡Macquarie Island is a UNESCO World Heritage Site. When humans arrived on the island in 1810£¬ they brought rats£¬ mice£¬ cats and rabbits on end. Subsequently£¬ all of them were out of controland damaged the ecology on the island dramatically. Both rats and cats developed an appetite for native birds£¬ making the birds endangered. Rabbits apparently multiplied and caused soil erosion. To remove the rabbits£¬ a virus was released. But the decrease of the rabbits caused cats to eat more native birds. In the 1980s£¬ a substantial number oftrapsand dogs were used to catch the cats. In comparisonwith the departure of the cats£¬ the number of mice£¬ rats and rabbits exploded once again£¬ especially the rabbits£¬ which developed an immunity to the virus. The island was in chaos altogether. Ioweit to ourselves to restore the island. So on behalf ofthe association I am here calling for the conservation of the biological diversity. But this intervention is a long£¬ much-delayed ending to a sad story.