They confront each other with raised feathers, spread wings, open beaks, raised claws and loud screeching and growling.
Some of these muscles act to raise the feathers, others to depress them.
Adults and young combat the desert heat by panting, and adults also raise dorsal feathers and expose their legs during incubation.
The male selects the nest site which he shows to the female while posturing with raised back feathers, wings arched over his back, tail spread and bill pointed vertically downwards.
"Fresh Eggs" would have been more rewarding, however, if the author hadn't dodged the issues his novel raises by having Calvin's daughter grow feathers.
This result suggests that although females spend more time than males in the nests for nest building, egg laying, incubation and nestling raising [ 39], feather bacterial communities of both sexes were equally affected by nest microorganisms.
Male blue tits have an ultraviolet reflective crown patch which is displayed in courtship by posturing and raising of their nape feathers.
A male attracts a female to his territory through song and a display involving raising the black crown feathers, fluffing the tail, slow wingbeats, and a short flapping flight.
With expectations raised, Cruz ruffled feathers among mainstream Republicans by helping to bounce House speaker John Boehner into a confrontational stand-off over the normally routine continuing budget resolution.
The male's visual display involves standing on open ground with the head and tail raised, its white feathers fluffed, and its gular sac (neck pouch) filled with air.
