This 8 April 2020 video from Britain says about itself:
BTO Garden BirdWatch – Telling apart House Sparrow and Dunnock
Join BTO’s Paul Stancliffe as he explains how you can tell apart House Sparrow and Dunnocks in your garden.
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Dear Kitty. Some blog 
this is such a helpful video to an ignorant bird watcher like me, thank you… best wishes, Valerie
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Thank you so much, Valerie! All the best for you, your blog and all people in New Zealand in these coronavirus days!
Dunnocks were introduced to New Zealand in the 19th century:
http://nzbirdsonline.org.nz/species/dunnock
So were house sparrows:
http://nzbirdsonline.org.nz/species/house-sparrow
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