A young Adélie is covered with uniform dark-gray fuzz the color of an average rock. It is also shaped like an average rock. When it's tiny it is under its mother's or father's warm pouched-out stomach. When you first see them it's as if the parent was sitting on one or two large gray fur eggs.
It grows fast. When it's a little bigger, it lies on the ground and stuffs its head underneath its father's or mother's warm stomach.
Now it's not growing bigger so much as it's growing a suit of legitimate penguin plumage underneath the fuzz. When it has the right outfit it will be able to swim underwater in the icy sea and not get soggy or chilled. In the meantime it stands around on the rocks amid puddles of guano.