Because it is covered in interesting insects and snails. I only took a few photos, but probably could have spent ages taking more photos, but then the teddy bears wouldn't have got their costumes. So here are just some of the beautiful and intriguing insects we saw - thanks Sarah for identifying them!
needle fly - a type of stone fly
rosemary beetle, wonderfully irridescent and stripy!
parent bug, so called because it carries its eggs and then later its young under its body as it moves around.
There were also numerous snails and at least two species of ladybirds.
What interesting insects have you seen on fences recently?