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Timing of the stages in the Zebra Finch, Society Finch, and chicken. Solid line is the development of the Zebra Finch, dashed line is the development of the chicken, and dotted line is the development of Society Finch. The timing of the stages is determined from the average time reported in staging papers (Hamburger and Hamilton, 1951; Yamasaki and Tonosaki, 1988).
