Periodically rotating and rearranging eggs in a nest ensures equal heating. It also prevents the shell membrane from adhering to the shell, which could interfere with hatching.
As might be expected of creatures so heavenly in color, the disposition of bluebirds is particularly angelic. Gentleness and amiability are expressed in their soft musical voice. Tru-al-ly, tru-al-ly, they sweetly assert when we can scarcely believe that spring is here; tru-wee, tur-wee they softly call in autumn when they go roaming through the countryside in flocks of azure. - Neltje Blanchan, Birds Worth Knowing, 1917
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