Gastrointestinal parasitism in lapwings (roundworms)
Gastrointestinal parasitism in lapwings (Vanellus vanellus) is an infestation of the digestive tract of this wading bird by roundworms, also called nematodes. These parasites live in the stomach, intestines, or sometimes the gullet of the...
What is it?
Gastrointestinal parasitism in lapwings (Vanellus vanellus) is an infestation of the digestive tract of this wading bird by roundworms, also called nematodes.
These parasites live in the stomach, intestines, or sometimes the gullet of the bird. They are common in wild birds living in wetlands or grasslands, the lapwing's natural habitat.
This condition mainly affects young lapwings and birds that are weakened or stressed, for example after an injury, a harsh winter, or time in a care facility.
Commonly observed signs
These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.
Related signs — each one links to its page:
In infected lapwings, signs are often subtle at first.
Progressive weight loss may be seen despite an appetite that is sometimes maintained, dull and ruffled feathers, reduced activity, and general weakness.
In more severe infestations, diarrhea or abnormally soft droppings appear. The crop or digestive tract may seem distended in some captive birds.
Very young lapwings (chicks) can show marked growth retardation and higher mortality rates than adults.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
Several genera of gastrointestinal nematodes can parasitize wading birds like lapwings, including worms belonging to families found in waterfowl and grassland birds.
Infestation most often occurs through accidental ingestion of eggs or larvae present in soil, water, or vegetation, or through eating prey (insects, earthworms, mollusks) that harbor larval stages of the parasite.
Young age is a significant risk factor, as chicks and juveniles are less resistant than adults.
High bird density at the same site, poor sanitation in rehabilitation centers or captive settings, stress from injury, cold, or malnutrition, and a weakened immune system all favor the development of heavy parasite burdens.
Transmission
Contamination occurs mainly through oral ingestion: the bird swallows nematode eggs or larvae present in its environment (damp soil, standing water, vegetation) or by eating invertebrates carrying larvae.
The life cycle of some nematodes requires an intermediate host (insect, earthworm, mollusk), which explains why wetland areas rich in invertebrates promote infestation.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
Diagnosis is based on a complete veterinary examination combined with fecal analysis (fecal flotation) to detect and identify parasite eggs under the microscope.
In some cases, endoscopy or post-mortem examination may be necessary to confirm the presence of adult worms in the digestive tract.
Treatment
Treatment involves administering broad-spectrum antiparasitic drugs prescribed and dosed only by a veterinarian, given the particular sensitivity of wild birds to certain drugs.
Nutritional support and rehydration may accompany treatment in debilitated birds.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
In the wild, there is no direct prevention applicable to wild birds.
In rehabilitation centers or captive settings (conservation breeding, recovery aviaries), prevention relies on good sanitation of soil and water sources, avoiding overcrowding, regular cleaning of feeding areas, and veterinary monitoring of newly admitted birds before introduction to other individuals.
Possible complications
Heavy infestation left untreated can lead to intestinal blockage or inflammation, anemia, severe stunted growth in young birds, and even death from exhaustion and malnutrition.
Birds already weakened by injury or other disease are more likely to develop severe forms.
When to see a veterinarian
A rescued lapwing shows visible weight loss or abnormally dull plumage.
Abnormal stools—soft or containing suspicious material—are observed.
The bird shows marked weakness, refuses to eat, or remains listless.
A young lapwing shows obvious stunted growth compared to its peers.
Any debilitated wild bird should be brought promptly to a wildlife rehabilitation center or veterinarian.
Prognosis
The outlook is good if infestation is detected and treated early, particularly in adult birds in overall good health.
It becomes more guarded in young birds with heavy parasite loads or in birds already weakened by other conditions, where the risk of death is higher.
Frequently asked questions
Is parasitism in lapwings dangerous for humans or domestic animals?
No, the gastrointestinal nematodes specific to lapwings are not considered transmissible to humans or domestic animals under normal conditions.
How can a private individual tell if a lapwing found is parasitized?
It's impossible to know without a veterinary examination. A thin, weak bird or one with dull feathers should be entrusted to a professional or a wildlife rescue center for a reliable diagnosis.
Can you deworm a lapwing you've found yourself?
No, self-medication is strongly discouraged. Wild birds are sensitive to certain substances, and only a veterinarian can choose appropriate and safe treatment.
Are all wild lapwings carriers of worms?
The presence of a few parasites is common and often well tolerated in a healthy wild bird. Problems mainly arise when there is a high parasite load or general weakening of the bird.
References
ESCCAP — European Scientific Counsel Companion Animal Parasites
WOAH — Organisation mondiale de la santé animale (ex-OIE)
Content reviewed by the TunisieVet editorial team · Updated 22 August 2026
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