The Eurasian Sparrow-hawk has settled in Amsterdam, and this has been bad news for House Sparrows. Ten years ago the sparrow population in Amsterdam was 40,000 birds. Today the number has fallen to around 5400, in large part due to the sparrow-hawks.
Eurasian Sparrow-hawks in Amsterdam find House Sparrows a tasty meal.
Researchers have been keeping track of the sparrow population in Amsterdam for the past two years. The hawks favor the sparrows over other similar birds, like Blue and Great Tits, because the sparrows tend to congregate in the same places over time and they tend to travel in groups. This makes them easier for the Sparrow-hawks to hunt.
Researchers recognized that one hawk could be responsible for up to 400 sparrow deaths in a season. Sparrow-hawks in turn are threatened by hawks in Dutch forests. Many have fled to the cities to feast on sparrows and avoid capture themselves.
The sparrow has been recognized as a threatened species in the Netherlands since 2004.
Source: Sperwer bedreigt huismus
