Have you noticed that spring seems to be arriving a little earlier now than it used to?

To measure how our climate is changing, the BBC and The Woodland Trust have recently joined forces to organise what they hope will be the biggest ever survey into the onset of spring in the UK.

They are asking participants to record their first sightings of six species commonly regarded as harbingers of the season: bumble-bees, frogspawn, seven-spot ladybirds, peacock butterflies, swifts and the flowers of hawthorn.

From the results they will be able to build up a complete picture, monitoring changes, how different species are adapting, and what can be done to help our wildlife and plants.

The survey is called Spring Watch, and you can find out more about it by logging on to: www.bbc.co.uk/springwatch