Buddha say speek truth always,don't look bad,don't listen bad.always thinking positive,stay always positive,speek positive and good , always helpful to birds,trees,environment,humans,animals.
If we all save nature and its creatures, then nature will save us. This is the law of nature.
The more damage man causes to nature, the more damage will be done to man.
That is why Lord Buddha taught mankind that nature and its creatures should be protected.