The RSPB Big Garden Birdwatch tracks species such as starlings and song thrushes, which have declined by 80% and 70% since the survey began in 1979.
Held every year by the RSPB, the survey seeks to help identify the state of the county's bird population.
"The Big Garden Birdwatch is an important survey which allows us to track bird activity and it is brilliant that so many people are keen to take part".
People taking part in this year's Big Garden Birdwatch will be providing conservation scientists with valuable data about the changes in numbers of birds using our gardens in winter, enabling them to help protect our wildlife for future generations.
"Once we have received everyone's results RSPB experts analyses the data and are able to see which birds are doing well, and importantly, which species may be in trouble and in need of our extra support".
All of the findings are submitted to the RSPB, to help the charity create a snapshot of United Kingdom wildlife.
More than half a million people are expected to take part in the RSPB's Big Garden Birdwatch this weekend by watching and counting their garden birds.
The unusual weather this winter could affect which birds are seen in gardens.
The RSPB said it was likely there would be fewer birds because they have been less reliant on garden feeders. "The more people who take part, the better the results will be and the more geographically representative it will be", said Mr. Bashford.
Last year the House Sparrow was the most commonly sighted bird in the United Kingdom - but which species will it be this year? Results will help all the organizations involved build their understanding about the threats facing garden wildlife.
In preparation for the Birdwatch, a weekend at Fairhaven Lake included the opportunity to make bird feeders - and officials at the Centre were delighted at the response. Wherever you live, you can help give nature a home.