Abstract
In many bird species the total song repertoire consists of an overt repertoire normally uttered, and a silent repertoire produced only under special circumstances. A silent repertoire can be inferred from specific vocal responses of an individual to hearing parts of its own silent repertoire uttered by another bird (‘sympathetic song’). The silent repertoire plays a prominent role in dueting birds, in particular those with sex-specific overt song repertoires, where the overt repertoire of one partner is the silent repertoire of the other. This is here exemplified with a pair of the slate-coloured boubou L. funebris. Silent repertoires should be taken into consideration when relating the complexity of birds' vocal behaviour to the size or structure of their forebrain vocal control areas.
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