The RSPB's Big Garden Birdwatch records the birds people spot and uses the data to track their numbers.
from BBC News - Home Big Garden Birdwatch: The winners and losers over 40 yearshttps://https://bbc.in/2HxbHgB
from BBC News - Home Big Garden Birdwatch: The winners and losers over 40 yearshttps://https://bbc.in/2HxbHgB
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