Amazing information about canaries

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Researchers have shown that,in the male canary, vocalism develops in four distinct phases; 1.Food begging;Consisting of shrill and high-pitched calls,present for about four weeks after birth. 2.Sub-song;When the first attempts to sing are evidenced.The sounds are of low volume. 3.Plastic song;Consisting of variable qualities,but with improved structure and some indication of the stereotyped quality to follow. 4.Stable song;Which persists during the mating season,but which deteriorates the plastic song until the next mating season. There is also evidence of year-round rhythm.There is a correlation between the bird's type of song and his testosterone blood levels.