we live on the earth ,but we are not alone in the world . everyone know we should keep the balance of nature ,or we don't always do as we say .a species can become endangered with different reasons .but the very important one is their living places are ruined .we cut down trees without plant new ones ,and we pollute the place where animal live .because of this ,they have no home and they are going to be out .other reason is money .many tigers are killed by those who want to sell our fur and use their bones for medicine .we should do everything which can be done to change the situation ,or wild animals can only exist in our memories
