Confidence votes 210. Antigone is considered a tragic hero, because tragic heroes have several qualities: They are royal, they have a tragic flaw that leads to their downfall, they have an unhappy ending, and lastly the character is worthy of concern. First, Antigone is royalty. This is shown through her bloodline in several ways.
The down feathers of eider ducks provide insulation due to lack of barbules and ability to fluff. Infrared image of a goose, showing its insulating capacities. Down feather structure is important for insulating properties. Eiders insulate their arctic nests with down feathers. Click/tap images for attribution and license information.
The action is akin to rubbing the hands with dirt and sand to remove oil, grime and grit off it! Birds take dust baths apparently to clean themselves and get rid of parasites hiding in the skin. The dirt would effectively smother even stubborn parasites in addition to absorbing excess oil and grime from the feathers. Preening after the bath would then help remove these impurities along with the dust. Dust bathing is more common among birds that do not have auropygial gland. Typical examples include the ostrich, kiwi and emu. These birds would usually take dust baths at regular intervals to keep their feathers clean and fluffy.