The black swift reaches speeds of up to 111 km/h. Strizh has been in the air non-stop for most of his life. In the air, he can eat, drink, sleep, mate. In fact, he lives in the sky and in the sky.
Glass, skyscraper windows and mirrored surfaces in the city are a serious danger to birds. Birds perceive the reflection as an extension of open space and crash into the glass at full speed. Especially many birds die during migration. According to the technology of counting ornithologists, this kills as many birds every year as there are buildings in the country. For our country, this is more than half a million.