As the days become longer and lighter during late winter, the bird's eyes detect the growing brightness and through the nervous system the pituitary gland in the brain is induccd to release hormones which in turn stimulate the sex glands to release sex hormones. Many of the bird's activities, including singing, depend upon an increase in the sex hormone level.
Tits will begin to sing in January if the weather is mild. At the end of February, the flocks of tits break up. Many males and females, when their breeding instinct is reawakened, return to the same areas where they bred in the previous year, so the same two birds often pair up again. Once the young arc able to fend for themselves the partnership dissolves and the male and female go their separate ways during autumn.
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