By Rhododendrites - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=125462845
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Mossie
Where does this species come from?
Eurasia and North Africa.
What is its invasive status in South Africa?
NEMBA Category 3.
Where in South Africa is it a problem?
Western Cape Province, Eastern Cape Province, KwaZulu-Natal Province, Free State Province, Gauteng Province and Limpopo Province.
How does it spread?
Human beings are responsible for the spreading of this bird species e.g. they spread through pet trade.
Why is it a problem?
They can crowd out native birds, disrupt food supplies, damage crops and transmit diseases. Large aggregations around buildings produce annoying noise and large quantities of faeces.
Sources:
(*) https://en.wikipedia.org/wiki/House_sparrow(*) https://ebird.org/species/houspa
(*) https://search.macaulaylibrary.org/catalog?taxonCode=houspa