At the beginning of breeding season, mature egrets grow beautiful long plumes on their backs. They use these to put on displays to attract a mate. The males do most of the displaying. Great egrets were nearly hunted to extinction so these plumes could be used to decorate hats. Now protection laws are in place.
This still single egret has a come hither look to it as it displays its plumes.
Great Egret (Ardea alba)
UT Southwest Medical Center Rookery