Since the NZ Garden Bird Survey began in 2007:
- Silvereye (tauhou), New Zealand’s most common native garden bird, has declined 44%.
- Tūī (kōkō) has increased 14%, suggesting that some urban restoration efforts are starting to pay off.
- Welcome swallow (warou), a relatively recent coloniser, has increased by 52%.
- Several introduced birds that often feed on ground-dwelling invertebrates have declined by 10% or more: Blackbird, Dunnock, Chaffinch, Song thrush and Starling.
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