People sometimes kill birds without meaning to. When people cut down forests to build houses and , they destroy the homes and food of Birds. If the birds have nowhere else to go and  to eat, they will die out.

    Pollution may cause some birds to die. Birds that eat fish from polluted water get poison In their bodies. Then they cannot lay eggs. New birds can't be born.

    Now people protect birds by passing the laws to control hunting and pollution，by setting up some special parksall the birds are safe from hunters, and by teaching people to care about birds rather than kill them.

 dogs popular?

   some visitors like to feed them?

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