#RFB-11000653Reading: Fill in the BlanksAcademic,CoreMedium
Tail Feathers
Official Question Material
Prep: Varies
Most tail feathers [blank] an interlocking microstructure similar to wing feathers. Arranged in a fan shape, these feathers support precision [blank] in flight. Typically, birds have six pairs of feathers on the tail, which display increasing levels of asymmetry toward the outer pairs. In some birds, tail feathers have evolved into showy [blank] that are useless in flight.
Sample Answer & Audio Transcript
Most tail feathers feature an interlocking microstructure similar to wing feathers. Arranged in a fan shape, these feathers support precision steering in flight. Typically, birds have six pairs of feathers on the tail, which display increasing levels of asymmetry toward the outer pairs. In some birds, tail feathers have evolved into showy ornaments that are useless in flight.
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