About 500,000 people are expected to take part in a yearly charity birdwatch this weekend - and you can take part!
The Royal Society for the Protection of Birds wants everyone to note down the numbers of each sort of bird in their garden or local park during an hour.
In 2007, about 400,000 people took part in the survey and counted six million birds in 236,000 gardens.
The charity uses the information to see which type of birds need help and which are doing well.
Sarah Kelly, one of the RSPB's Big Garden Birdwatch organisers, said: "The great thing about Big Garden Birdwatch is that anyone can do it. You don't need to be an expert, all you need is a pen and paper."
Those who take part are asked to submit their results online and the results will be published in March.