Gastrointestinal parasitism in the kakapo (roundworms)
Gastrointestinal parasitism caused by roundworms is an infestation of the kakapo's digestive tract by nematodes, thread-like internal parasites. This condition particularly affects young birds and weakened individuals, but can occur at any...
What is it?
Gastrointestinal parasitism caused by roundworms is an infestation of the kakapo's digestive tract by nematodes, thread-like internal parasites.
This condition particularly affects young birds and weakened individuals, but can occur at any age.
The kakapo is a nocturnal, flightless parrot native to New Zealand, now classified as one of the world's most endangered species.
Key point
The kakapo is a critically endangered species; any illness, even apparently minor, receives heightened veterinary attention because the loss of a single individual has a significant impact on the species' survival.
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:
Clinical signs are often subtle with light infestation.
When the parasite burden is heavier, progressive weight loss may be seen despite maintained appetite, or conversely a decrease in appetite may occur.
Stools may become soft or irregular, and parasites may sometimes be visible directly in the droppings.
The bird may appear more tired and less active, with feathers losing their shine.
In severe cases, anaemia may develop, recognisable by pallor of the mucous membranes.
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 roundworms (nematodes) that live in the bird's digestive tract. The species involved belong particularly to genera commonly found in birds, such as ascarids and capillaria.
Contamination most often occurs through ingestion of eggs present in soil, vegetation or droppings from other birds.
Some worms have a direct cycle, with the egg becoming infective after time in the environment, while others require an intermediate host such as an insect or mollusc.
In the kakapo, a ground-dwelling species, close contact with bedding and droppings promotes this type of contamination.
Young kakapos, particularly chicks and juveniles, are more susceptible because their immune system is still immature.
A humid environment and insufficient litter replacement increase the risk of contamination by parasite eggs.
Close contact with other birds, including uncontrolled wild species, is an additional risk factor.
Already compromised health status—for example following illness or transport stress—promotes the clinical development of infestation.
Transmission
Transmission occurs through the faecal-oral route: the bird ingests roundworm eggs present in the environment contaminated by droppings from infested birds.
There is no direct transmission between the kakapo and humans.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
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Treatment
Treatment relies on administering antiparasitic drugs from the broad-spectrum anthelmintic family, selected and dosed only by a veterinarian specializing in avian wildlife.
Nutritional support and sometimes supplementation may accompany treatment in weakened birds.
Post-treatment monitoring through faecal examination confirms the effectiveness of the anthelmintic and the absence of relapse.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Prevention relies on regular monitoring of droppings through faecal examination as part of kakapo population surveillance.
Environmental control, particularly litter management and spacing between individuals, reduces the risk of cross-contamination.
On the sanctuary islands where most kakapos live, limiting contact with other bird species that carry parasites is part of the health management measures.
Preventive antiparasitic treatments may be administered in a targeted manner by veterinary teams, particularly in young birds or before certain transfers between sites.
Vaccination
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Possible complications
Heavy infestation that goes untreated can lead to severe anemia from blood loss or nutritional deficiency. Young birds may develop stunted growth. In the most serious cases, intestinal blockage from worm accumulation or digestive perforation are possible, though rare. A bird weakened by parasitism also becomes more vulnerable to secondary infections.
When to see a veterinarian
The bird loses weight without apparent cause despite normal or maintained appetite. Droppings become abnormally soft, irregular, or contain material resembling worms. The bird appears unusually tired, lethargic, or less active than usual. Mucous membranes appear pale, which may suggest anemia. Any unusual sign in a kakapo should be reported without delay to the conservation program's veterinary team, given the species' rarity.
Prognosis
The prognosis is generally good when infestation is detected and treated early, with complete recovery after antiparasitic treatment. In a young bird, weakened bird, or one carrying a very high parasite load, the prognosis becomes more guarded as anemia and weight loss may compromise survival. Given the extreme rarity of the species, each affected individual receives immediate and careful veterinary care.
Frequently asked questions
Can gastrointestinal parasitism in the kakapo be transmitted to humans?
No, the roundworms involved are specific to birds and are not transmitted to humans.
Does a kakapo carrying worms always show symptoms?
No, a low parasite load may not cause any visible signs. It is often a heavy load or an already weakened bird that develops symptoms.
How can a kakapo become infested when it lives in a protected environment?
Even on predator-free sanctuary islands, the soil, vegetation, and droppings can contain parasite eggs, particularly if other birds are present.
Is antiparasitic treatment risky for such a rare species?
Treatment is decided and adapted with extreme caution by veterinarians in conservation programs, taking into account the fragility of each individual.
References
WOAH — Organisation mondiale de la santé animale (ex-OIE)
WSAVA — World Small Animal Veterinary Association
Content reviewed by the TunisieVet editorial team · Updated 02 September 2026
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