They may not look much but these little pockets of water are very important.

There are over 280 species of Hoverfly in the UK and they are very important pollinators. Many of these species lay their eggs in stagnant water, normally in rot holes in trees but because the trees on Barnes Common are relatively young, they have yet to develop the cavities needed to form these rot holes. By carving a hollow into a tree stump, we create an artificial rot hole which hoverflies can use to lay their eggs in.Pretty clever, eh!