Changes

'''Additional functions'''

'''Additional functions'''

*Courtship displays

*Courtship displays

*Defence

*Defence

Cryptic colouring (camouflage)

*Cryptic colouring (camouflage)

 

*Colour mimicking

Colour mimicking

*Dominance/subdominance conflicts

 

Dominance/subdominance conflicts

 

*Aggressive territorial behaviour

*Aggressive territorial behaviour

*'''Contour feathers''': these are the predominant feather covering the body.

*'''Contour feathers''': these are the predominant feather covering the body.

*'''Coverts''': are small contour feathers of the wing and the tail.

*'''Coverts''': are small contour feathers of the wing and the tail.

*'''Remiges''': are large stiff feathers of the wing.

*'''Remiges''': are large stiff flight feathers of the wing.

*'''Retrices''': are large stiff flight feathers of the tail.

*'''Retrices''': are large stiff flight feathers of the tail.

*'''Specialised adapted feathers''': include semiplumes, hypopnea, filiplumes and bristles.

*'''Specialised adapted feathers''': include semiplumes (enhance thermal isulation, enable courtship), hypopnea, filoplumes (hairless feathers than grow along down feathers and monitor the position of adjacent feathers) and bristles (stiff feathers with sensory and protective functions).

*'''Down feathers''': can be subcategorised into adult, natal and powder down.  Powder down are specialised down feathers that disintegrate and produce a powder (keratin) that is spread through the feathers during preening.  They are found throughout the body among the down and contour feathers.

*'''Down feathers''': help insulate the bird and contributes to buoyancy. They can be subcategorised into body, natal and powder down.  Powder down are specialised down feathers that disintegrate and produce a powder (keratin) that is spread through the feathers during preening.  They are found throughout the body among the down and contour feathers.

==Physiology of the Feather==

==Physiology of the Feather==