The Big Schools' Birdwatch helps to track bird numbers in school grounds, and gives the charity an insight into changes in bird populations.
The results contribute towards the annual Big Garden Birdwatch.
Last year's survey found that the most commonly seen garden birds were:
- Black headed gull
- Carrion crow
The RSPB's Big Schools' Birdwatch forms part of this year's Big Garden Birdwatch - the world's biggest wildlife survey.
As the RSPB's birdwatch survey gets underway, here's a guide to how you can spot some of the most common garden birds.