At Eynsham Beavers we had some fun making "bee bricks".
We made then from 'cob', a traditional building material that is made by mixing sand, straw and loam.
(You need the sand and straw because otherwise "you'll never work a loam".)
Laid on their sides in a warm place out of the rain, these bricks make good homes for some of our species of soiltary bee.
You can find out more about bee bricks here (Youtube video from Buckfastleigh Wildwatch)