A security camera(安防摄像头) in a Mexican city filmed something bad. Hundreds of yellow-headed blackbirds fell from the sky. They fell onto the ground like a black cloud. Most birds flew away but some of them stayed on the streets and they died.
No one really knows what happened to the animals. Some people say that dirty air killed those birds. Others say that the animals are killed by electricity(电) because they stand on power lines. And also many people believe that there is a predator. They say another bigger animal want to have those birds as food. So it chases the birds to the ground to make a catch. However, the true reason is still a mystery(谜).
Bird lovers say those birds stay in the US and Canada in summer. They fly to Mexico for winter. It’s warmer there.
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