Lesser Sulphur-Crested Cockatoo

The Lesser is a loud bird. Not as cavernous as a Moluccan, but startlingly powerful for her size, with a sharp, metallic screech that carries through walls and across gardens. Two predictable contact calls bracket each day — one at sunrise and one at dusk — and these are non-negotiable. They are how cockatoos check in with their flock, and your bird will perform them whether or not you wish to participate.

Talking ability is modest. I score her a 4 out of 10. A well-socialised Lesser will pick up a handful of clear words, her own name, perhaps a cheerful greeting, and an alarming repertoire of mimicked household sounds — the microwave beep, the smoke alarm chirp, my husband's whistle. She is not a conversationalist in the way an African Grey is, but what she does say she says with theatrical timing.

Managing noise is largely a matter of managing emotion. A Lesser who is fed well, exercised, and given meaningful social contact screams far less than one who is bored or anxious. I always counsel terraced-house and apartment dwellers to consider another species; the contact calls alone will test the patience of even sympathetic neighbours, and no amount of training will eliminate them entirely.

I feed my Lessers a base diet of high-quality pellets — Harrison's, TOPs, or Roudybush — making up roughly 60 to 70 per cent of daily intake. Like the Galah, the Lesser is prone to fatty liver disease, and a seed-heavy diet is the fastest route to that diagnosis. Pellets give a predictable nutritional floor that fresh foods then build upon.

Fresh produce makes up the remainder, with a strong emphasis on dark leafy greens, broccoli, capsicum, sweet potato, carrot, and a modest amount of fruit. I serve a chop most mornings and a warm soft-food mash a few times a week, particularly during cooler weather. Sprouted pulses are a favourite enrichment. Avocado, chocolate, onion, and anything caffeinated stay well clear of the cage, as they do for any psittacine.

Seeds and nuts are treats, not staples. A few sunflower seeds tucked into a foraging toy, a single almond cracked in the morning, perhaps a slice of walnut for training — that is the appropriate volume. The same fat restriction I apply to my Galahs applies here. A Lesser allowed to free-feed sunflower will develop fatty liver disease within a few short years, and the condition is far easier to prevent than to reverse.

The Lesser Sulphur-Crested is, on the whole, a robust little bird when properly housed and fed, but she shares the cockatoo family's particular vulnerabilities. An annual wellness examination with an avian veterinarian, baseline bloodwork, and a faecal screen are the foundation of preventive care. I weigh my birds weekly on a perch scale and keep a written log; a 10-gramme drop in a 300-gramme bird is meaningful and warrants investigation.

• Psittacine Beak and Feather Disease (PBFD) — a viral disease cockatoos are especially susceptible to; testing of breeding stock and incoming birds is essential.
• Feather-destructive behaviour and self-mutilation — overwhelmingly behavioural in origin, driven by unmet social needs, boredom, or hormonal frustration.
• Aspergillosis — a fungal respiratory infection, more likely in poorly ventilated or damp environments.
• Psittacosis (Chlamydia psittaci) — a zoonotic bacterial infection; quarantine and testing of new arrivals is non-negotiable.
• Fatty liver disease (hepatic lipidosis) — the consequence of seed-heavy or otherwise high-fat diets, as discussed above.

Powder-down is heavy in this species, as in all cockatoos, and I run HEPA filtration in every room a Lesser occupies. It protects both the bird's respiratory tract and the human household. For current clinical guidance I refer owners to the Association of Avian Veterinarians (AAV), and I encourage every Lesser owner to establish a relationship with a board-certified avian vet before bringing a bird home, not after the first emergency.

For a single Lesser I recommend a cage no smaller than 24 by 24 by 36 inches, with bar spacing of 5/8 to 3/4 of an inch. Bigger is invariably better. The cage is where she sleeps and retreats; it is not where she lives. A play stand, a separate foraging tree, and ideally a dedicated bird-safe room transform a lonely cage-bound existence into a rich one.

I insist on a minimum of three hours of supervised out-of-cage time daily, and most of my placements achieve considerably more. Climbing structures, swings, knotted rope perches of varying diameter, and a generous rotation of destructible toys — palm, balsa, vegetable-tanned leather, untreated pine — keep beak and mind occupied. A bored cockatoo invents her own entertainment, and you will not enjoy her choices.

Environmental controls matter. HEPA filtration manages the powder-down. Ambient humidity around 50 to 60 per cent supports feather and respiratory health. Keep the cage well clear of the kitchen — non-stick cookware fumes are rapidly fatal to parrots — and away from draughts, direct sun, and aerosolised cleaners or scented candles. Twelve hours of quiet, dark sleep is non-negotiable; a separate sleep cage in a quiet room is the simplest solution for households that stay up late.