Working with bird song

Green Gym tidying up some new woodland planting.  Thousands of trees have been planted all over the local area by the Parks Trust.  
Somebody had a birthday so fancy cakes took over from the normal biscuits for our break.  
The ' jolly hockeysticks' lady who was overseeing our work, was obviously a retired teacher, and gave me a 'well done' for asking a question!!  I felt like asking for a gold star but would probably have been given a detention for being cheeky.
Takes all sorts!