Gastrointestinal parasitism in the Crab Plover (roundworms)
The Crab Plover (Dromas ardeola) is a shorebird that inhabits coastal regions and wetlands, particularly in North Africa and the Persian Gulf. Like many wild birds or those kept in captivity (zoos, wildlife rehabilitation centers), it can h...
What is it?
The Crab Plover (Dromas ardeola) is a shorebird that inhabits coastal regions and wetlands, particularly in North Africa and the Persian Gulf. Like many wild birds or those kept in captivity (zoos, wildlife rehabilitation centers), it can harbor roundworms (nematodes) in its digestive tract. Gastrointestinal parasitism is a frequent cause of weakness in young or stressed birds. It usually remains mild in healthy wild birds but can become problematic in captivity, where bird density and stress encourage parasite multiplication.
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:
Signs are often subtle at first. Progressive weight loss may occur despite maintained appetite, or conversely, loss of appetite. Feathers become dull and ruffled, and the bird appears listless and less active. Diarrhea or loose droppings may develop, sometimes with worms visible to the naked eye. In young Crab Plovers, stunted growth is possible. In severe cases, dehydration and general weakness develop, which can be life-threatening.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
Parasitism is caused by roundworms (nematodes) that colonize the bird's intestine, stomach, or crop. Several genera of avian nematodes may be involved depending on the region and environment. Birds become infected by ingesting eggs or larvae present in water, mud, soil, or through prey (small invertebrates) that themselves carry parasitic larvae.
Young birds are more susceptible because their immune system is immature. Captivity or overcrowding in an enclosure or aviary increases risk, as does soiled and poorly maintained ground. Stress from transport, environmental change, or concurrent illness weakens natural defenses. Unbalanced diet or contamination of water and food also promotes infestation.
Transmission
Transmission occurs through ingestion of nematode eggs or larvae present in the environment (soil, mud, contaminated water) or via intermediate hosts such as certain invertebrates.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The veterinarian performs a complete physical examination and requests a fecal analysis (microscopic examination of stools) to identify parasite eggs. In some cases, endoscopy or other diagnostic tests may be recommended to assess the bird's overall condition and look for possible complications.
Treatment
Treatment relies on antiparasitic drugs suitable for birds, prescribed and dosed only by a veterinarian specializing in wildlife or avian medicine. Nutritional support and rehydration may be provided depending on the bird's condition.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Rigorous maintenance of enclosures, aviaries, or pools is essential to limit environmental contamination. Overcrowding should be avoided and water and substrate should be changed regularly. Regular veterinary monitoring with fecal analysis allows detection of parasites before symptoms appear. Quarantine of new arrivals at care facilities or wildlife parks is also recommended.
Possible complications
Severe untreated infestation can cause intestinal obstruction, chronic malnutrition, irreversible stunted growth in young birds, or death from general decline, especially if the bird is already weakened by other stress factors.
When to see a veterinarian
The bird loses weight for no clear reason despite normal appetite.
Worms are visible in the droppings.
The bird appears withdrawn with ruffled feathers that persist.
A young dromae shows stunted growth or delayed development.
Diarrhea persists or recurs.
Prognosis
The outlook is generally good if the parasitism is detected early and treated promptly by a veterinary professional. It becomes guarded in young birds or cases of heavy worm burden combined with other illnesses, where weakness can be severe.
Frequently asked questions
Can the dromad transmit these worms to humans?
No, gastrointestinal nematodes of birds such as dromaeosaurs are not considered transmissible to humans under normal conditions.
How to tell if your captive dromeas is parasitized?
Only a fecal analysis performed by a veterinarian can confirm the presence of parasites, even in the absence of visible symptoms.
Is gastrointestinal parasitism common in wild birds?
Yes, a certain level of parasitism is common and often well tolerated in healthy wild birds. It becomes problematic in cases of stress, overcrowding, or weakening of the bird.
Should all birds in a group be systematically treated?
It depends on the situation. The veterinarian assesses whether group treatment is necessary, particularly in captivity where cross-contamination is easily possible.
References
WOAH — Organisation mondiale de la santé animale (ex-OIE)
FAO — Organisation des Nations unies pour l'alimentation et l'agriculture
Content reviewed by the TunisieVet editorial team · Updated 23 August 2026
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