The nature ecosystem is being pushed with human bomb population. Human cut so many timbers for their house and furniture. Certainly, the house for wild bird is decreasing. They could not find any timber for their nest. 

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Some bird find house near human housing. In, underdeveloped country like my hometown, people is allowed to shoot bird. Certainly, the population of the bird is decreasing in my hometown. On the other hand, shooting a bird in US is forbidden so we can find some bird at small city. Unfortunately, the food reserves are limited at the city. The bird will died slowly if they have no food.

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You can feed wild bird too to protect them from the lack. You can put some bird food at your backyard and some wild bird will eat it. You may give them a water basin. The bird will drink at swim at the basin. Sometimes, our family has some remained rice. We put it at roof. The sparrow likes the rice very much. I think it is better to give the wild bird rice than throw it to rubbish. Some sparrow always comes to my backyard. Even a pair has a nest in my roof. We just let them live at it.

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The reason why I feed wild bird is I like them. I like to hear their nice voice. They have beautiful voice like paradise sound. Certainly, the sound is more beautiful than Julio Iglesias or Bon Jovi.

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It is not inflict a financial loss to feed wild bird at your house. The bird food is also cheap. If you have no money, you can give your remain breakfast like bread, corn, popcorn, cereal, fruit, etc. Some bird like sparrow will like it. You may put some birdhouse as their nest at backyard. Alternatively, Plant a tree for their house too. Your house will have some bird.