Budgerigar Overview
The budgerigar (Melopsittacus undulatus) is the most widely kept pet bird in the world. Native to Australia, where wild populations still range widely across the interior, the budgerigar has been bred in captivity for over 150 years, producing a vast range of colour mutations far removed from the original wild green and yellow. In captivity, budgerigars typically live between 5 and 10 years, though some individuals reach 12 to 15 years with excellent care.
Budgerigars are highly social animals. In the wild they live in large flocks, and this social drive persists in captive birds. A single budgerigar kept without companions needs significant daily human interaction to remain psychologically healthy. Pairs — including same-sex pairs — are generally happier and less prone to the boredom and associated problems that a solitary bird may develop.
Housing
The cage should be as large as practically possible. Crucially, width is more important than height: budgerigars fly horizontally, not vertically, so a wide cage allows natural flight behaviour. Bar spacing should be no more than 1.2 cm to prevent a bird getting its head trapped between bars.
Avoid cages made with galvanised wire, as the zinc coating can cause heavy metal toxicity if chewed. Stainless steel or powder-coated cages are safer alternatives. Perches should vary in diameter to promote foot health — uniform perches of a single diameter can lead to pressure sores. Natural wood from safe species such as willow or apple is ideal; avoid branches from trees known to be toxic to birds.
Diet
Seed-only diets are extremely common among budgerigar owners, and they are nutritionally inadequate. Seeds are high in fat and typically deficient in vitamin A, calcium and a range of other nutrients. Budgerigars fed exclusively on seed over their lifetime are at higher risk of nutritional deficiency diseases, obesity and associated organ problems.
A healthier diet includes formulated pellets as a base — transition gradually by mixing with seed, reducing the seed proportion over several weeks. Fresh leafy greens such as spinach, kale and rocket are valuable additions. Carrot, cooked egg and small amounts of apple are also suitable. Apple pips should be removed, as they contain cyanogenic compounds. Avocado is toxic to budgerigars and must never be offered. Fresh clean water must be available at all times and changed daily.
Common Health Conditions
Scaly Face Mites (Cnemidocoptes pilae)
Scaly face mite infestation is one of the most recognisable conditions in budgerigars. The burrowing mite causes a distinctive crusty, pitted, honeycomb-like appearance around the beak, cere (the fleshy area above the beak containing the nostrils), feet and legs. Affected birds develop thickened, chalky deposits in these areas. The condition is readily treatable with ivermectin drops applied by an avian vet, but if left untreated it can cause permanent beak deformity. Any budgerigar showing crusty or abnormal growths around the face or feet should be seen by a vet promptly.
Air Sac Mites (Sternostoma tracheacolum)
Air sac mites are parasites that colonise the trachea and air sacs of birds. Although they are more commonly associated with Gouldian finches, they do affect budgerigars. Signs include a clicking or wheezing sound when the bird breathes, open-mouth breathing, tail bobbing (a visible pumping motion of the tail with each breath), and changes to or loss of vocalisation. Affected birds may also appear lethargic. Treatment is with ivermectin or moxidectin under veterinary guidance. Air sac mites are contagious between birds, so any affected bird should be isolated from cage-mates while undergoing treatment.
Psittacine Beak and Feather Disease (PBFDV)
Psittacine beak and feather disease is caused by a circovirus that targets the feather follicles and immune system. In budgerigars, it causes progressive abnormalities in feather development — feathers grow in misshapen, fail to grow at all, or fall out and are not replaced. Beak deformities can also occur. There is no curative treatment. The virus is highly contagious and can persist in the environment; testing new birds before introducing them to an existing flock is strongly recommended. Any bird showing progressive unexplained feather abnormalities should be assessed by an avian vet.
Budgerigar Fledgling Disease (Polyomavirus)
Polyomavirus causes high mortality in nestlings and fledglings, and is particularly relevant for breeders. Adult birds may carry and shed the virus without displaying signs of illness, making control in breeding colonies challenging. Vaccination is available in some European countries. Owners who breed budgerigars should discuss polyomavirus management with an avian vet.
Tumours
Tumours are very common in budgerigars, particularly in birds over five years of age, and they are a leading cause of illness and death in older birds. Lipomas — benign fatty lumps — are frequently found beneath the skin and are often visible as soft swellings. Testicular tumours are among the most common tumours in male budgerigars; they can cause hormonal changes that alter the colour of the cere from its normal blue to brown. Renal (kidney) tumours are also common and can cause lameness by pressing on the sciatic nerve as it passes near the kidney. Abdominal swelling may indicate a tumour or another internal mass. Any lump, change in cere colour or unexplained lameness warrants examination by an avian vet.
Crop Problems
The crop is a pouch in the oesophagus where food is temporarily stored before digestion. Crop problems in budgerigars include sour crop (an overgrowth of yeast — Candida — causing regurgitation and a distinctive sour smell), crop impaction (blockage), and abnormal motility. These conditions require veterinary assessment and appropriate treatment rather than home management.
Thyroid Hyperplasia (Goitre)
Iodine deficiency can cause enlargement of the thyroid gland (goitre) in budgerigars. It was historically more common when seed-only diets were universal; it is less frequently seen in birds given a varied diet including formulated pellets. Signs include wheezing, regurgitation and weight loss. The condition responds to iodine supplementation and dietary correction under veterinary guidance.
Moulting
Budgerigars moult their feathers regularly, typically twice a year. During a moult, some feather loss and the presence of pin feathers (new feathers emerging from their sheaths) are normal. However, excessive feather loss outside of a normal moult, bald patches or abnormal feather structure are not normal and warrant veterinary assessment.
Finding an Avian Vet
Not all small animal vets have experience treating birds, and budgerigars in particular are sometimes underserved because owners may not realise that specialist care is available or necessary. In the UK, the BSAVA (British Small Animal Veterinary Association) maintains directories of vets with avian interest or expertise. In Europe, the European Association of Avian Veterinarians (EAAV) can direct owners to qualified avian specialists. The key principle is to establish a relationship with an avian-experienced vet before a health crisis occurs, rather than searching during an emergency.