Nature's Calendar is a survey conducted by thousands of volunteers who record the signs of the seasons in the United Kingdom.
This could mean noting the first ladybird or swallow seen in your garden in spring, or the first blackberry in your local wood in autumn.
If you live in the UK, you don’t have to be an expert to take part, and lots of help is given, including a recording guide which is available to download for free.
This kind of recording has moved from being a harmless hobby to a crucial source of evidence as to how our wildlife is responding to climate change.