Gastrointestinal parasitism of bearded vultures (roundworms)
Gastrointestinal parasitism by roundworms (nematodes) is a common condition in the bearded vulture, a large scavenging bird of prey. These parasites live in the digestive tract of the bird and feed at its expense. In wild birds as in indivi...
What is it?
Gastrointestinal parasitism by roundworms (nematodes) is a common condition in the bearded vulture, a large scavenging bird of prey. These parasites live in the digestive tract of the bird and feed at its expense. In wild birds as in individuals in captivity or in care centers, this parasitosis can go unnoticed if it remains discreet, but it can also seriously weaken the animal, especially in young people or already weakened individuals.
Key point
The bearded vulture being a rare species and threatened with extinction in several regions, any parasitic condition in an individual must be taken seriously with a view to conserving the species.
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:
The signs are not always visible, especially at the start of an infestation. When the infestation becomes more significant, we can observe progressive weight loss despite a preserved or reduced appetite, dull and less well-groomed plumage, a drop in general liveliness and abnormal fatigue. Young, growing birds may show slower development than normal. Abnormally soft or watery stools are possible, sometimes accompanied by the presence of worms visible to the naked eye. In severe forms, dehydration and paleness of the mucous membranes may appear, a sign of a very poor general condition.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
The disease is caused by nematodes (roundworms) that take up residence in the bearded vulture's stomach, intestine, or other portions of the digestive tract. Several genera of nematodes may be involved in scavenging raptors, some being quite specific to scavenging birds. Infestation generally occurs through ingestion of eggs or larvae present on consumed carcasses, in the environment or via intermediate hosts depending on the type of parasite.
Young bearded vultures, particularly those recently out of the nest or learning to feed independently, are more vulnerable. Birds weakened by other illness, lack of food, injury or significant stress are also more susceptible. The density of attendance at certain feeding sites (mass graves, feeding plots) can encourage the accumulation of parasites in the environment. Birds kept in care centers or in captivity in insufficient hygienic conditions also present an increased risk.
Transmission
Contamination occurs mainly orally, by consuming food (carcasses, viscera) soiled by nematode eggs or larvae, or by ingesting prey or insects serving as intermediate hosts for certain parasites.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The veterinarian, often specialized in wildlife, relies on the clinical examination of the bird and especially on an analysis of the droppings (coproscopy) allowing nematode eggs to be identified under a microscope. Depending on the case, other additional tests such as a blood test may be carried out to assess the general condition and look for anemia or inflammation.
Treatment
Treatment is based on the administration of antiparasitics belonging to the family of broad-spectrum dewormers active on nematodes, prescribed and adapted by the veterinarian according to the weight and condition of the bird. Nutritional support and rehydration may be combined in cases of marked weakening.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Prevention is based on good hygiene management of feeding sites, with regular cleaning and the elimination of carcasses in advanced decomposition. In care centers or in captivity, regular disinfection of aviaries and preventive parasite control by examining droppings are recommended. Maintaining a good general nutritional state of the bird limits the consequences of a parasitic infestation.
Possible complications
A large, untreated infestation can lead to anemia, severe weight loss, immunosuppression making the bird more susceptible to other infections, and in extreme cases intestinal obstruction or perforation. In young people, lasting growth retardation is possible.
When to see a veterinarian
The bird shows visible weight loss despite an apparently normal diet.
Abnormally soft, watery or worm-containing stools are observed.
The bird shows unusual fatigue, depression or persistent dull plumage.
A young bearded vulture seems to have a slower development than its congeners.
Any deterioration in the general condition of a bird collected in a care center.
Prognosis
The prognosis is generally good if the infestation is detected and treated at an early stage, with good recovery of the general condition after treatment. On the other hand, in a bird already weakened or in the event of a massive untreated infestation, the prognosis becomes more reserved, particularly in young individuals or individuals already weakened by other causes.
Frequently asked questions
Is bearded vulture gastrointestinal parasitism dangerous for humans?
No, bearded vulture nematodes are not known to be transmissible to humans. It is not a zoonotic disease.
How do you know if a bearded vulture is parasitized?
The only reliable method is an analysis of the droppings by a wildlife veterinarian, who looks for worm eggs under a microscope. Visible signs such as weight loss or fatigue often appear late.
Can you deworm a bearded vulture yourself?
No. The bearded vulture is a protected and threatened species. Any intervention must be carried out by a veterinarian or an authorized care center, who will adapt the treatment to the condition of the bird.
Does this parasitosis mainly affect young bearded vultures?
Young birds, whose immune systems are still developing, are indeed more vulnerable to the consequences of this parasitosis than healthy adults.
References
WOAH — Organisation mondiale de la santé animale (ex-OIE)
ESCCAP — European Scientific Counsel Companion Animal Parasites
Content reviewed by the TunisieVet editorial team · Updated 29 September 2026
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