Black and white stripes combined with a knobbly body make the caterpillar look remarkably like bird droppings. This unappetising outfit is a clever ploy to hide in plain sight, a trick used by ...

Song of the Reed: Swallowtail is the first of four seasonal Radio 4 dramas following life on a wetlands nature reserve in Norfolk over one year, starring Sophie Okonedo and Mark Rylance.