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.
In their chicks, it is covered by a dense layer of woolly down. An overlapping coat of feathers grows over this layer. The outer feathers are covered in a greasy waterproof coating. It's mainly the layers of feathers that keep the water off the penguins' skin and help retain heat.