They are also used for aggressive displays.

It has been suggested that these are used in aggressive display.

Stag will also moan during aggressive displays or when resting.

Birds may fluff up their flank feathers as an aggressive display or preceding an attack.

The infant coloration reduces the visibility of white, which is associated with aggressive displays by the species.

An aggressive display involves fluffing up the feathers and holding the bill high.

The aggressive display by France paid off and they won 16-3.

The most important aggressive display of territorial dominance is in the horning of the ground.

She only noticed that his teeth were on aggressive display.

They may also perform an aggressive display in defence, hissing and striking without actually opening the mouth.