Birds usually build their nests with sticks, leaves or grass. But do you know that birds are also building their nests with rubbish these years? The rubbish includes cigarette butts (烟头) and plastic bags.
A group of European scientists looked into about 35, 000 studies on bird nests. They found that birds have used man-made things in nests almost everywhere on Earth except Antarctica (南极洲). Some rubbish seems to be helpful. This is why birds "like" putting it in their nests. For example, cigarette butts have special smell, so they can keep insects away and protect the baby birds. Plastic bags are useful in keeping the animals warm, and other hard things, such as paper cards, can make nests stronger.
However, in the end, human rubbish may only cause more damage to birds. The toxic (有毒的) chemicals in cigarettes hurt the baby birds. They may get sick or have shorter lives, according to a study.
To make matters worse, if the cigarette still burns when the bird brings it back to its home, it may set fire to the nest. Pieces of fishing net may also trap birds, and it's impossible for them to get out by themselves. If the baby birds eat other kinds of rubbish by accident, they will also get hurt.
Our bird friends in the air are feeling the bad effects of humans polluting the environment. To help them, we can recycle, reduce and reuse the products we use every day. Don't let our products find their way into the natural world.
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