The document discusses conventions of short films based on a analysis of children's cartoons like Bob the Builder and Postman Pat. It notes that short films and episodes of cartoons tend to be around 10-15 minutes to maintain young viewers' attention spans. Main conventions discussed include short runtimes (3-6 minutes typically for short films), classic narrative structures with 5 stages (equilibrium, disruption, recognition, action, new equilibrium), a limited number of main characters (typically 2-3) to allow audience connection, and inclusion of both protagonists and antagonists in stories. The document examines how these conventions are followed in the film "For the Birds" and the author's own short film "Bernard the Bird."