Gastrointestinal parasitism in cassowaries (roundworms)
Gastrointestinal parasitism in cassowaries refers to infestation of the intestine and sometimes the stomach of this large flightless bird by roundworms, also called nematodes. These parasites live at the bird's expense and feed at its cost....
What is it?
Gastrointestinal parasitism in cassowaries refers to infestation of the intestine and sometimes the stomach of this large flightless bird by roundworms, also called nematodes.
These parasites live at the bird's expense and feed at its cost.
It is a common problem in captive-raised cassowaries, particularly in zoos and breeding facilities, because of repeated contact with contaminated ground.
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 depend on the number of worms present and the bird's general condition.
Progressive weight loss is often seen despite sometimes-preserved appetite, diarrhea or abnormal droppings, dull and poorly maintained plumage, and a drop in overall energy.
In young cassowaries, stunted growth is possible.
In severe cases, the bird may show dehydration, pale mucous membranes suggesting anemia, and sometimes worms visible in the droppings.
Tenderness or swelling of the abdomen may also be noted with heavy infestation.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
Infestation is caused by various gastrointestinal nematodes, notably species from the genera Ascaridia, Capillaria, and Heterakis, known to parasitize ground-dwelling birds including ratites.
The bird becomes infected by swallowing parasite eggs present on the ground, in water, or on contaminated vegetation, or sometimes by consuming an intermediate host such as an insect or earthworm carrying larvae.
Young cassowaries are more susceptible because their immune system is still developing. Overcrowded, damp, poorly drained, or infrequently cleaned enclosures promote the buildup of parasite eggs in the soil. Stress from transport, breeding, or a change in environment can weaken the bird's defenses and trigger active disease. The absence of a regular worming program significantly increases the risk.
Transmission
Transmission occurs mainly through the oral route, by foraging on ground contaminated with worm eggs from the droppings of infested birds.
The cycle may be direct, or indirect via an intermediate host depending on the parasite species involved.
Environmental contamination is favored by crowding of birds, moisture, and soil that is not regularly changed.
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 fecal examination under the microscope to identify the parasite type and estimate the parasite load. A thorough clinical exam assesses the bird's general condition, hydration, and weight. In some cases, a blood test may be recommended to check for anemia or evaluate overall health status.
Treatment
Treatment involves administering an antiparasitic drug chosen by the veterinarian based on the type of worm identified. Supporting care may be provided for dehydration or marked weakness, such as fluid therapy or nutritional support. Treatment effectiveness is usually monitored with another fecal test a few weeks later.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Prevention depends on proper enclosure management: regular cleaning, effective soil drainage, rotating grazing areas when possible, and limiting bird density. A preventive worming program established with your veterinarian based on fecal test results helps reduce parasite load. Quarantining new arrivals and screening them for parasites on arrival are also recommended. Regular monitoring of the birds' body condition helps detect problems early.
Possible complications
Severe untreated infestation can lead to intestinal obstruction, severe anemia, stunted growth in young birds that may be permanent, or death in severe cases. Weakened birds also become more vulnerable to other infections.
When to see a veterinarian
The bird loses weight noticeably despite apparently normal appetite. Worms are visible in the droppings. The bird has persistent diarrhea or abnormal droppings. A young cassowary shows poor growth or dull plumage. The bird becomes lethargic, weak, or stops eating.
Prognosis
The prognosis is generally good when the infestation is detected and treated at an early stage.
It becomes more guarded in the case of heavy parasite burden, especially in young birds or when complications such as severe anemia or obstruction are present.
Frequently asked questions
Can the cassowary's parasitism be transmitted to other birds in the park?
Yes, worm eggs passed in droppings can contaminate the soil and infest other birds sharing the same enclosure. Good cleaning reduces this risk.
Should you deworm a cassowary even if it shows no symptoms?
Preventive worming based on regular fecal analysis is often recommended, as many infected cassowaries show no visible signs in the early stages.
Is this disease dangerous for humans?
Gastrointestinal nematodes in cassowaries are not considered transmissible to humans under normal contact conditions.
How do you know if the treatment has been effective?
The veterinarian generally recommends a follow-up fecal examination a few weeks after treatment to verify the absence of parasite eggs.
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 22 August 2026
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