Did you know that the plumage of Cormorants is not water repellant? You can see them often in a wing drying or sun bathing position.
After fishing, cormorants go ashore, and are frequently seen holding their wings out in the sun. All cormorants have preen gland secretions that are used ostensibly to keep the feathers waterproof. Some sources state that cormorants have waterproof feathers while others say that they have water permeable feathers.
Still others suggests that the outer plumage absorbs water but does not permit it to penetrate the layer of air next to the skin. Alternate functions suggested for the spread-wing posture include that it aids thermoregulation, digestion, balances the bird or indicates presence of fish. A detailed study of the great cormorant concludes that it is without doubt to dry the plumage.