penguins are adapted well to antarctica because they have blubber, which insulates them and keeps them warm, also they have waterproof feathers & their beaks help them catch fish for them and...
they have webbed feet for powerful swimming. a streamlined body to glide through water, insulating blubber (fat) to keep warm, and watertight feathers.
The Emperor penguin has adapted to the environment it currently lives in because it has a layer of waterproof feathers and it also has a layer of fat underneath the feather to keep itself warm.