Animation about ten-year-old twins Wayne and Lucien Cramp - brothers who are complete opposites of one another. Wayne uses a bird call whistle to attract the Crested Marsh Swallow. Unfortunately they all settle on top of the Cramps' house and despite Mr Cramps' best efforts, the birds refuse to leave. But when Mr Winkle offers money in return for the birds, Mr Cramp and Wayne change their tactics.