A clinging seed pod is a type of plant structure that contains seeds and is designed to cling to animals or other objects in order to be transported away from the parent plant. The term 'BUR' is an abbreviation for the word 'BURR, ' which is a type of clinging seed pod. BURR seed pods have hooks or barbs on the outside that allow them to attach to fur or clothing, allowing them to be spread far away from the parent plant.