[yareally]

There are many kinds of sparrows, but the one people usually refer to as a pest is the Eurasian House Sparrow. Can be found on 6 continents, reproduces quickly, and are gregarious (most other sparrows don't live in groups).

I find their antics to be interesting, but they're aggressive to other birds, especially for nesting sites (and they'll nest anywhere, unlike many of the birds they compete with).

[kwhitefoot]

They are only a pest outside their home range. In the UK they are in decline.

"Conservation of the house sparrow

Data suggests the UK's house sparrow population declined by 66% between 1977 and 2015, with urban populations faring worse than rural ones."

https://www.nhm.ac.uk/discover/house-sparrow-passer-domestic...

[yareally]

Funny enough, so are European Pigeons and Starlings. We have too many here in the States, but on the decline in Europe.

I'm guessing part of it is due to our sanitary habits here. Lots of food is trashed in a way that makes it easy for them to forge for it.