During autumn, when the photoperiod decreases (less daylight), the male canary's testes regress and androgen levels drop dramatically, resulting in decreased singing frequency.
Selama musim gugur ketika penyinaran menurun (periode siang hari berkurang), testis kenari jantan mengecil dan tingkat androgen menurun secara drastis mengakibatkan penurunan frekuensi bernyanyi.