FEATHERS AND P A T T E R N S
5
B
FIG. 2. (Cont'd.) Spatial and temporal variation in feathers. B . Saddle, neck, and
flank feather from a Light Sussex hen.
C
FIG. 2. (Cont'd.) Spatial and temporal variation in feathers. C . Feathers from
the humeral tract of goshawks in their first and second years. Top row:
first-year feathers with a "droplet" pattern of black. Bottom row: the homologous
feathers of a 2-year-old bird. The follicles have now produced a barred feather.