In Australia, they are an invasive species. They are now endemic, out competing native species across the continent.

It's strange, isn't it? I love them.

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).