The 40th year of the RSPB's Big Garden Birdwatch (the Birdwatch is presumably the big item rather than, necessarily the garden?) has revealed some interesting changes (https://www.theguardian.com/environment/2019/jan/25/bye-bye-blackbird-rspbs-big-garden-birdwatch-marks-40-years). Numbers of Blackbirds, House sparrows, Song thrush and Starlings have continued downward trends whilst Coal tits, Collared doves, Wood pigeons and Wrens have shown marked increases. The changes might well, in some cases, reflect what people put into bird feeders. Perhaps the species that are attracted to our gardens could, in some cases, deter other species.
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