Today, for two days, people in the UK are coming together to count birds for the world's largest garden wildlife survey.
You can do it from the comfort of your own garden, meet up with friends in the park or just as easily from the window of your home.
All you have to do is count for an hour and share what you've seen with the organisers! From house sparrows to blackbirds - you might even be lucky enough to spot one of the UK's top five birds!
