#1. Pennaceous feathers have a hollow central stalk or quill, called a calamus.
These feathers are stiff.
The Source:
Page #8
Ornithology #20
Feathers: The Anatomy
of a Feather #1

#1. Pennaceous feathers have a hollow central stalk or quill, called a calamus.
These feathers are stiff.
The Source:
Page #8
Ornithology #20
Feathers: The Anatomy
of a Feather #1
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