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Winter migratory birds that come to winter in our country are dying before winter. It's because of the transparent window, which is the grave of the migratory birds.

I'm Yongsik Lee.

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Soundproof wall at a university in Suwon, Gyeonggi-do.

Under the window is a bird that has been dead for several days.

It is a winter migratory bird, 'Congbird'.

One student has counted 13 soybeans that died near the soundproofing wall since October 28th.

On the soundproof wall, traces of collision such as feathers remain.

[Hsuan / Gyeonggi-dae: I felt so sorry that many birds died than I thought, and death that no one knows is meaningless.]

The sound barrier is a relatively short section of about 20m in length, but the collision is frequent as it is located right in front of the mountain, a bird's path.

Winter migratory birds were found dead on September 9 in Suwon Yeongtong and Hwaseong Dongtan.

There are five 6 species, 10cm in size, the smallest hairy hawk and the red-headed squirrel.

At the Wildlife Rescue Center, birds crashing into the clear window are being rescued.

[Kim Bong-kyun / Chungnam Wildlife Rescue Center Rehabilitation Manager: He was found to be experiencing severe concussion while being hit by a window and is being treated.]

The National Institute of Ecological Research found that the most common impacts on transparent window collisions were worms (75%) and winter migratory birds (5%).

(Video coverage: Kang Yun-gu, Screen provided by National Ecological Center)