The Budgerigar is a lively little bird, and his action when courting is very comical; for he stands facing his hen, singing his chuckling little song and bobbing his head up and down with a circular motion, as if trying to indicate a halo around her face.
Foreign Birds for Cage and Aviary, by Arthur G. Butler (1910). Click here to read the book online, or download it free, from the Internet Archive.
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