Use of dithiine-tetracarboximides as bird repellent

A dithiine-tetracarboximide of formula (I)

• in which
• R1 and R2 are identical or different and represent hydrogen, C1-C8-alkyl which is optionally monosubstituted or polysubstituted by halogen, —OR3, —COR4, or represent C3-C7-cycloalkyl which are optionally monosubstituted or polysubstituted by halogen, C1-C4-alkyl or C1-C4-haloalkyl, or represent aryl or aryl-(C1-C4-alkyl), each of which is optionally monosubstituted or polysubstituted by halogen, C1-C4-alkyl, C1-C4-haloalkyl, —COR4 or sulphonylamino,
• R3 represents hydrogen, C1-C4-alkyl, C1-C4-alkylcarbonyl, or represents aryl which is optionally monosubstituted or polysubstituted by halogen, C1-C4-alkyl or C1-C4-haloalkyl,
• R4 represents hydroxyl, C1-C4-alkyl or C1-C4-alkoxy,
• n represents 0 or 1,
• capable of being used as bird repellent.