Angel wing in ducks and geese is a cosmetic issue more than a serious health concern. However, the deformity, which goes by various other names — airplane wing, crooked wing, slipped wing, split wing, carpal deformity — mars the appearance of an otherwise beautiful backyard duck or goose.
What Is Angel Wing?
Angel wing is a condition in which the flight feathers of one or both wings of a duck or goose don’t lie smoothly against the body, but rather twist outward. Commonly, the entire last section of the wing flops to the outside, angling away from the body like an airplane’s wing. But the condition may also occur when the primary feathers overlap in reverse order — over each other, rather than under, from outer to inner feather.
Angel wing may involve one or both wings. When it affects only one wing, it is likely to be on the left side.
Researchers classify the degree of twist as follows:
|
Classification |
Description |
|
Normal |
Primaries fold smoothly against body |
|
Slight |
Primaries angle out less than 30° |
|
Moderate |
Primaries angle out 30° to 60° |
|
Severe |
Primaries angle out more than 60° |
What Causes Angel Wing?
As ducks and geese grow, sometimes their little wing muscles, tendons, and bones have trouble holding up all the newly sprouting flight feathers, and one or both wings may droop slightly, without twisting outward. When a wing droops, though, watch for the possibility that it may begin to angle outward or twist at the wing joint. If the condition is not corrected, the bird will mature with the wing awkwardly and permanently sticking out instead of gracefully folding against the body.
The exact causes of angel wing aren’t fully understood. The prevailing theory relates to a diet that causes too-rapid growth. But the condition is likely to result from a combination of factors. Here are some of the many theories:
- high protein, high energy diet
- calcium deficiency
- vitamin D deficiency
- vitamin E deficiency
- manganese deficiency
- dietary toxins and antioxidants
- poor nutrient absorption
- improper incubation
- insufficient space to exercise
- heredity
Which Domestic Waterfowl Are Affected?
Angel wing is most likely to affect young ducks and geese during their fastest growth period. Ducks grow fastest during their first 8 weeks, geese up to 12 weeks. Early signs can be subtle and are more easily detected when viewed from behind.
Waterfowl raised for meat don’t live long enough for this clumsy appearance to be an issue. But in waterfowl kept for show it is a defect. An exception is in curly-feathered Sebastopol geese, for which twisting of the wing feathers is a breed characteristic. In all other mature waterfowl the condition, though not serious, mars the appearance of otherwise beautiful backyard waterfowl.
Geese are more likely than ducks to develop this condition. Among ducks Muscovies are more likely to be affected that other ducks. Ganders and drakes more commonly develop the condition than hens. Wild waterfowl rarely develop this problem, except when humans interfere with their natural diet.
Why is it a problem?
Though not a disease, angel wing affects a duck or goose in these several ways:
- Mars the bird’s appearance
- A defect in show birds
- Limits the bird’s ability to fly
- Can affect the bird’s balance
- Makes the bird more vulnerable to predation
- Can become uncomfortable
- A sign of diet/management issues
How to Treat Angel Wing?
While a duck or goose is still young, you can usually correct angel wing by using vet wrap to secure the last two joints of the wing. The wrap will hold the feathers in their natural position and help the wing grow in the right direction until the wrist joint gets strong enough to support feather growth.
Wrap in a figure eight around the bird’s wing. Secure the wing by wrapping around the body to support and immobilize the wing. Make the wrap tight enough that it won’t fall loose, but not so tight that you can’t wiggle a finger underneath.
If the twist is still in the early stages, remove the wrap for part of the day so the bird can exercise the wing. Some folks remove the wrap in the evening and replace it in the morning. Others find that the wrap is less likely to come loose if it is left on overnight and removed in the daytime.
In more advanced stages, remove and rewrap the wing every day or two, so it doesn’t bind as the bird grows. Repeat wrapping for a week or more, until the wing feathers no longer twist outward.
At the same time, review the bird’s diet and make any necessary corrections. Feed only a balanced and age-appropriate waterfowl diet.
How to Prevent Angel Wing?
You can easily prevent angel wing by providing enough space for swimming and wing flapping, and by not feeding your waterfowl for unnaturally rapid growth. That means avoiding a high-calorie diet — such as a high-protein, high-energy ration meant for meat birds — and especially one improperly balanced in vitamins and minerals for waterfowl.
If you notice that a bird’s wing is starting to droop or twist, you can often correct the situation by switching to a lower protein diet, such as might be provided by alfalfa pellets (available from most farm stores). Free ranging young ducks and geese so they can graze is another good way to reduce protein.
Once they reach 2 weeks of age, gradually switch them over from starter ration to a grower or maintenance ration having no more than 16% protein. Avoid overfeeding, especially if the birds have limited opportunity for exercise. And by all means, don’t feed them bread, chips, and other processed foods that aren’t even good for humans.
Frequently Asked Questions
When is angel wing most likely to appear?
Angel wing is most likely to appear during the early days when waterfowl grow the fastest. That would be up to about 8 weeks of age for ducks and 12 weeks for geese.
Does angel wing spread?
Angel wing is not a disease and does not spread from bird to bird. But it can affect more than one bird subjected to the same improper waterfowl diet and lack of opportunities to exercise.
Can a duck or goose with angel wing still fly?
A duck or goose with angel wing cannot fly properly, which can affect its ability to evade predators.
Can angel wing be reversed?
Angel wing may be corrected in the early stages. But once the wing structure has matured, angel wing is permanent.
How to prevent angel wing?
Prevent angel wing in ducks and geese by feeding a balanced and age-appropriate diet, and by providing ample living space for foraging and exercise.
Helpful Links
Keeping Ducks and Geese Together
And that’s today’s news from the Cackle Coop.
Gail Damerow has raised chickens, waterfowl, and various other poultry for more than 5 decades and has written several books about them, many available from the Cackle Bookstore. Above photo by Tony Alter from Newport News, USA, CC BY 2.0, via Wikimedia Commons.
