TITMICE, CHICKADEES: BUSH-TIT 
519 
of birds migrating at night, doubtless enables them to keep in close 
flocks while traveling through thickets, where their small, dull colored 
bodies would easily be lost sight of. 
In watching the passing flocks of Bush-Tits it would be well to 
notice the color of their eyes, for, as Mr. Ridgway discovered when on 
Triangles mark breeding and yearlong records in upper Sonoran foothill country 
the Wheeler Survey (1877, p. 414), and as the Mieheners have recently 
found when banding them, they vary in color of iris from almost white 
to dark brown (1928, pp. 134-135), apparently, Grinnell and Storer 
believe, without relation to age, sex, or season (1924, p. 580). 
The little birds were common among the junipers at Santa Rosa 
on June 5, 1903, going about for the most part in families; but one pair 
was just beginning to build in a juniper, gathering wool that the sheep 
