A vivid and contrasting flash of shade on the rump is a distinguished function of many hen species and in addition a helpful discipline mark. Yellow-rumped Warblers are distinguished from virtually all different small songbirds by their contrasting yellow rump patch, and the White-rumped Sandpiper is amongst a small variety of sandpiper species with white rumps, and so forth. However the telltale flash of shade from the rump feathers of those species will be utterly hidden when the birds are perched. Understanding how and when these feathers are seen is vital to utilizing these discipline marks with confidence.
The rump feathers are physique feathers — comparatively quick and usually formed feathers rising from the decrease again and (with different physique feathers) forming a streamlined shell across the whole physique. The wings fold up in opposition to the edges of the physique, for essentially the most half resting on prime of this clean shell of physique feathers.
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