The RSPB Big Garden Birdwatch is the world's biggest bird survey.
It is really easy to take part and doesn't take very much of your time but provides the RSPB with vital information.
In 2007, over 400,000 people took part by counting the birds in their garden for an hour. Together they spotted 6 million birds across 236,000 gardens. This helped the RSPB determine which species of bird had increased in number and which had numbers in decline. They can then identify which species of birds need help.
Since 1979, the number of house sparrows counted has fallen by 52% and the number of starlings by 76%. However, it isn't all bad news - chaffinchs and great tits have both seen their numbers increase since 1979 by 36% and 52% respectively.
To read more click here
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