Why Cormorants Spread Their Wings: Drying, Flapping and Wet-Feather Flight

The short answer is yes: cormorants can fly when their wings are wet, but not as easily or as efficiently as when their feathers are dry. Their feathers are less water-repellent than those of many other water birds, so after diving they often stand with wings outstretched to dry. This wing-spreading posture is one of the most recognizable sights on prairie lakes, especially on cool, calm mornings when birds perch on dead trees or rocky points.

Can Cormorants Fly When Their Wings Are Wet?

Cormorants can take off and fly with wet plumage, but they work harder to do so. Unlike ducks, whose feathers have a dense oily coating that sheds water, cormorant feathers are only partially waterproof. Water penetrates the outer feathers and soaks the downy layer close to the skin. This wet plumage adds weight and reduces the feathers’ ability to trap air, which normally provides lift and insulation. As a result, a wet cormorant must beat its wings faster and run across the water for a longer distance before becoming airborne.

On prairie lakes, you might see a cormorant laboring to take off from the surface, splashing with both feet while its wings churn. Once in the air, it often flies low over the water for a while, still burdened by the extra moisture. This is a good moment to note in field observations: the bird is not injured or distressed, but simply dealing with the physics of wet feathers.

Why Do Cormorants Dry Their Wings?

Cormorants dry their wings because their feathers absorb water during dives. Drying restores the feather structure needed for efficient flight and insulation. When feathers are waterlogged, the microscopic barbs and barbules that normally zip together and hold air become matted and heavy. Drying in the sun and wind allows the feathers to fluff up again and regain their insulating and aerodynamic properties.

The wing-spreading posture is not just about drying wings; it also exposes the breast and belly to the air. Cormorants often face the wind and may turn slowly, letting the breeze work through their feathers. On sunny days, the dark feathers absorb heat and speed evaporation.

This behavior is so common that many birdwatchers call it the “cormorant cross” or “spread-eagle” pose. It is most frequent after feeding dives, when the bird has spent considerable time underwater. You may see a cormorant hold its wings out for ten to twenty minutes or longer, depending on humidity, temperature, and wind.

Why Do Cormorants Flap Their Wings While Drying?

Flapping during drying helps shake off excess water and realign feather barbs. A cormorant typically begins with vigorous flapping immediately after emerging from a dive. This action throws off large droplets, much like a wet dog shaking. Then it may stretch its wings and vibrate them slightly, which helps separate clumped feathers and promote air circulation.

Flapping also serves a social signal. In a colony, a bird that flaps noisily when another approaches may be defending its perch or reinforcing pair bonds. However, the primary reason is mechanical: flapping accelerates drying and restores feather shape.

Why Do Cormorants Hold Their Wings Out?

Cormorants hold their wings out to maximize the surface area exposed to sun and wind, which speeds evaporation. The wings are held in a distinctive posture: the bird stands upright, with the wings extended horizontally or slightly upward, angled out from the body. Sometimes the tail is spread as well. This position is held for long periods and may be interspersed with slow wing beats.

Because cormorants lack the fully waterproof plumage of ducks, they depend on this behavioral adaptation. Without drying, a cormorant would lose too much body heat in cold water and would struggle to fly far. The habit is essential for survival on prairie lakes, where water temperatures can be chilly even in summer.

Feather Wettability and the Cormorant’s Trade-off

Feather wettability refers to how easily water penetrates a bird’s plumage. Cormorants have feathers with lower water repellency than ducks or grebes. This is not a defect but an evolutionary trade-off. Wettable feathers allow a cormorant to reduce buoyancy, making it easier to dive and pursue fish underwater. The bird can sink lower and stay under longer because it is less buoyant. The cost is that it must dry off afterward.

A cormorant’s outer contour feathers have a structure that allows water to pass through, while the downy underfeathers trap some air but can become saturated. After a deep dive, the bird may be noticeably heavier. This is why cormorants often need a long running start to take off from the water. In contrast, ducks pop up almost dry and can lift off quickly.

Wing Drying and Wet-Feather Flight: What to Observe in the Field

When watching cormorants on a prairie lake, you can learn a great deal by paying attention to their drying behavior and flight patterns. Here are some field notes and practical suggestions:

Seasonal and Weather Patterns

• Spring and fall: Cooler temperatures mean wet feathers lose heat faster. Cormorants may spend more time drying with wings spread, especially in the morning or after a long feeding session.
• Summer heat: Drying is quicker, but cormorants still spread their wings. On very hot days, the posture may also help with cooling, as air moves over the wet skin.
• Windy days: Cormorants often face into the wind while drying. The moving air increases evaporation and helps fluff the feathers.
• Humid, still days: Drying takes longer. Birds may hold wings out for over half an hour and flap more frequently.

How to Apply This on Your Next Outing

1. Bring binoculars and a notebook. Watch a cormorant from a respectful distance, ideally 100 meters or more, to avoid flushing it.
2. Time how long a bird holds its wings out after a dive. Note the weather: wind speed, temperature, and sun.
3. Watch the takeoff: a wet cormorant will usually run along the water for several meters before becoming airborne. A dry bird may need less distance.
4. Look for the difference after the bird has been drying for several minutes—its flight becomes more direct and higher above the water.
5. If you see a cormorant flapping without moving, it may be drying, not signaling alarm. Observe its posture: if wings are held open and the bird is still, it is likely drying.

Care and Respect for Cormorants

Cormorants are sensitive to disturbance, especially during nesting season. When they are forced to flush repeatedly, they lose energy and may abandon nests. Keep your distance, use binoculars or a spotting scope, and avoid approaching birds on exposed perches. If a cormorant stops drying and looks alert, you are too close. Back away slowly.

On prairie lakes, high water levels and human recreation can affect cormorant roosting sites. Supporting shoreline conservation and respecting no-entry zones during breeding months help these birds maintain their essential drying and resting areas.

Comparison: Cormorants vs. Other Water Birds

This table helps you quickly identify why cormorants behave differently. If you see a large dark bird with its wings held out like a coat drying on a line, it is almost certainly a cormorant.

Final Field Notes

The next time you walk along a prairie lake, pause when you see a cormorant with wings spread. Give it time. Notice how the bird adjusts its angle to the wind, how it occasionally flutters its feathers, and how the light reveals the texture of its wet plumage. These moments are small, but they show the daily work of a bird adapted to a wet world. Patient observation will reward you with a deeper understanding of why cormorants dry their wings and how wet-feather flight shapes their lives.