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Seasonal, testosterone-dependent changes in sexual behaviors are common in male vertebrates. In songbirds such seasonal changes occur in a learned behavior—singing. Domesticated male canaries (Serinus canaria) appear to lose song units (syllables) after the breeding season and learn new ones until the next breeding season. Here we demonstrate in a longitudinal field study of individual, free-living...
Singing of canaries is controlled by a chain of interconnected brain areas. One of these areas, the caudal nucleus of the ventral neostriatum (HVC), is sensitive to androgens and estrogens. In adult canaries, both male and female sing. Female song is structured differently from the male singing and characterized by a higher variability. Singing females were implanted with testosterone propionate...
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