Bug conga

A line of decorated pebbles stretching along part of the Great Northern Railway Trail in Cullingworth.  At the start of the line is this message:
Please let the bugs
Enjoy the conga
Don't move any

Let the line get longer
Some local children have obviosly been having fun during the school holidays.  I wonder how much longer the line will get?  Jeanneb53 has some lovely close ups of the stones in her extras today.