英语作文题目Why should we protect wild animals?

In this world,any mistakes are complement each other.I remember having such a story.There is someone in the mountain sheep flock,but there is always eaten by the Wolf,but the sheep are very healthy,is seldom ill.The sheep being eaten,shepherd stillhad.Then he put all the wolves to death.Henceforth never sheep be eaten.But many sheep have began to sicken and slowly died,sad dead shepherd.This tells us is that:the sheep because a Wolf pursued,they're healthy.And when there is no Wolf,they become lazy,slowly became sick.So any mistakes are complement each other,I will protect animals,protecting our nature.