The defining characteristic of bird integument is feathers: - derived originally from scales, so that scales and feathers are homologous - function in flight (flight feathers) as well as temperature regulation (contour feathers) - basic structure of feather calamus, rachis and vane, which are derived from a feather follicle (Fig.
(The defining characteristic of bird integument; is; feathers) (scales and feathers; are; homologous - function; L:in flight (flight feathers) (basic structure of feather calamus, rachis and vane; are derived; from a feather follicle)
The defining characteristic of bird integument scales and feathers basic structure of feather calamus, rachis and vane
is are are derived
feathers
homologous - function L:in flight (flight feathers
from a feather follicle