Slender-billed Cockatoo
Australia's clever long-beaked corella — a brilliant talker with serious enrichment demands.
Origin
Southeastern Australia — primarily Victoria and southern New South Wales
Lifespan
40–60 years
With proper nutrition & care
Size
15–17 inches (38–43 cm)
450–550 g (16–19 oz)
Quick Facts
| Origin | Southeastern Australia — primarily Victoria and southern New South Wales |
|---|---|
| Size | 15–17 inches (38–43 cm) |
| Weight | 450–550 g (16–19 oz) |
| Lifespan | 40–60 years |
| Care level | Advanced |
| Noise level | Moderate to loud for a parrot, with predictable piercing flock calls at dawn and dusk. Quieter overall than Umbrella or Moluccan Cockatoos but unsuitable for shared-wall living. |
| Talking ability | Exceptional — widely considered the finest talker among cockatoos, with clear diction and contextual use of phrases. Most well-socialised individuals build sizeable vocabularies and mimic household sounds with uncanny accuracy. |
| Beginner-friendly | 2/10 |
The Bird
Slender-billed Cockatoo at a Glance
The Slender-billed Cockatoo (Cacatua tenuirostris), better known to most keepers as the Long-billed Corella, hails from the open woodlands and grassy plains of southeastern Australia — chiefly Victoria and the southern reaches of New South Wales. In the wild they forage in noisy flocks, using that distinctive elongated upper mandible to dig deep for onion-grass corms, bulbs and roots that other cockatoos simply cannot reach. It is a tool, in the truest sense, and it shapes everything about how this bird thinks and behaves.
In size they sit comfortably between the Goffin's and the larger Umbrella Cockatoo — roughly 15 to 17 inches from beak tip to tail tip, weighing in around 450 to 550 grams. Plumage is predominantly white with a salmon-pink wash across the lores, throat and breast, a pale blue eye-ring, and that unmistakable ivory beak. With proper husbandry I expect mine to live 40 to 60 years, and I have placed birds I fully expect to outlive their first owner. That is a sobering thing to say plainly, but it must be said.
What sets the Slender-bill apart from its cousins is a combination most cockatoo keepers will find surprising: they are widely regarded as the best talkers in the entire cockatoo family, with clearer diction than many Amazons. Pair that with razor-sharp intelligence and a working beak built to dismantle nearly anything, and you have a parrot that demands a thinking household. I do not place these birds lightly. My placement philosophy here in West Palm Beach is straightforward — I want experienced homes who understand that a Long-billed Corella is not décor; it is a fifty-year commitment to an animal smarter than most dogs.
Slender-bills are bold, outgoing and relentlessly curious. They tend to bond strongly with their primary caregiver but, unlike Umbrellas or Moluccans, most well-socialised individuals stay reasonably balanced across the whole family rather than fixating obsessively on one person. That said, they are emotionally intense — they read the room, they hold grudges, and they remember slights for years. Treat them fairly and consistently and they reward you with one of the most engaging companions in aviculture.
The hallmark trait is their working beak. These birds want a job. In the wild they spend hours each day excavating; in captivity, that drive transfers directly onto cabinetry, skirting boards, remote controls and anything wooden within reach. This is not naughtiness — it is hard-wired behaviour, and any home that cannot accommodate it will end up with a frustrated bird and ruined furniture. Foraging toys, destructible wood, and shreddables are non-negotiable.
With children and other pets they can do well provided introductions are managed and the bird is never put in a position to feel cornered. They are playful, often clownish, and will invent games. They also push boundaries constantly, much like a clever toddler, so consistent gentle structure matters more than dominance. I spend considerable time before placement teaching step-up, target training and basic handling so my birds arrive in their new homes already understanding the rules.
Vocalization & Talking
Let me be honest: this is still a cockatoo. Long-billed Corellas have a piercing contact call that they will use at dawn and dusk without exception, and individual birds can be loud when excited, frightened or simply enthusiastic. They are quieter on the whole than Umbrellas, Moluccans or Sulphur-cresteds, but louder than a Goffin's at peak. If you share walls with neighbours, be realistic about that.
Where they truly shine is talking. Slender-bills are arguably the finest talkers in the cockatoo family — clear, conversational, and remarkably contextual. Many of mine pick up phrases after only a few repetitions and use them appropriately. They mimic household sounds, laugh, whistle complex tunes, and can hold what feels like a real exchange. For a keeper who values a verbal relationship with their bird, this species is hard to beat.
Apartment suitability is conditional. A single, well-enriched Slender-bill in a detached house with tolerant neighbours is workable. In a typical condominium or townhouse with shared walls, I generally do not recommend them. The morning and evening flock calls carry, and no amount of training will fully eliminate them — these are biological behaviours, not learned ones.
Diet
I feed all my Slender-bills a pellet-based diet as the foundation — Harrison's High Potency, TOPs, or Roudybush Maintenance, depending on the individual bird's history and condition. Pellets should make up roughly 60 to 70 percent of daily intake. Cockatoos in general are prone to obesity and fatty liver disease, and this species is no exception, so seed mixes as a staple are off the table. A modest amount of sprouted seed or a high-quality cockatoo seed mix can be offered as enrichment, not as the main course.
Fresh produce comes daily and should be varied. Dark leafy greens, broccoli, capsicum, carrot, sweet potato, squash, sprouted legumes and small amounts of fresh fruit all feature in my rotation. Because Long-billed Corellas evolved digging for corms and roots, I deliberately offer root vegetables and bury food items in foraging boxes — they need to use that beak the way nature intended, or the energy goes into your skirting boards.
Avoid avocado, chocolate, caffeine, alcohol, onion, garlic in any quantity, and anything high in salt or sugar. Sunflower seeds and peanuts should be treats only, never staples. Fresh clean water daily, changed at least twice. I send every bird home with a written diet sheet and a starter supply of the exact pellet they have been raised on so the transition is seamless.
Health & Lifespan
Long-billed Corellas are robust birds when fed and housed properly, but like all cockatoos they carry species-specific risks that any prospective owner should understand before committing. Annual avian-vet wellness exams with bloodwork are not optional in my book — they are how you catch problems early, when they are still treatable.
- Psittacine Beak and Feather Disease (PBFD) — a viral disease cockatoos are particularly susceptible to; I test all breeding stock and chicks.
- Fatty liver disease (hepatic lipidosis) — driven by high-fat diets and inadequate exercise; preventable with proper nutrition.
- Feather-destructive behaviour — usually rooted in boredom, hormonal frustration, or insufficient sleep and enrichment.
- Cloacal prolapse — seen in chronically over-bonded or over-stimulated cockatoos; a husbandry and behaviour issue as much as a medical one.
- Aspergillosis — a fungal respiratory infection most common in stressed or poorly ventilated birds.
Establish a relationship with a board-certified avian veterinarian before your bird comes home, not after a problem develops. You can locate one through the Association of Avian Veterinarians at https://www.aav.org.
Housing
Minimum cage dimensions for a single Slender-bill are 36 inches wide by 28 inches deep by 48 inches tall, and frankly I prefer larger. Bar spacing should be 3/4 to 1 inch, and the cage must be solidly constructed of powder-coated steel — these birds will defeat anything flimsy, and I have seen them undo standard cage clips in minutes. Stainless steel locking clips on every door are standard in my placements.
Enrichment is where most keepers underestimate this species. Long-billed Corellas need a constantly rotating supply of destructible toys — soft pine, balsa, palm, cardboard, vegetable-tanned leather, woven palm — plus foraging puzzles that make them work for portions of their food. I rotate toys weekly so nothing becomes stale. A bored Slender-bill is a screaming, plucking, escaping Slender-bill, and that is not the bird's fault; it is a husbandry failure.
Out-of-cage time is non-negotiable: a minimum of three to four hours daily, supervised, in a parrot-proofed area. They need a play stand or two, climbing opportunities, and direct interaction with their family. Twelve hours of dark, quiet sleep nightly is essential — sleep deprivation in cockatoos drives hormonal and behavioural problems faster than almost any other factor. A separate sleep cage in a quiet room is well worth the investment.
Frequently Asked Questions
- Are Long-billed Corellas good for first-time parrot owners?
Honestly, no. They are intelligent, long-lived, loud at times, and require sophisticated enrichment and consistent training. I recommend starting with a smaller, less demanding species and gaining several years of hands-on parrot experience before considering a Slender-bill.
- How well do Slender-billed Cockatoos actually talk?
Exceptionally well. They are regarded as the best talkers in the cockatoo family, with clearer diction than many Amazons and a knack for using phrases in context. That said, no parrot is guaranteed to talk — buy the bird, not the promise.
- Will my furniture survive a Long-billed Corella?
Only if you give the bird better things to chew. That working beak is built to dig and dismantle, and the drive is hard-wired. Provide a constant rotation of destructible wood toys and foraging puzzles, and supervise out-of-cage time in parrot-proofed rooms.
- Are they suitable for apartment living in South Florida?
Generally not, if you share walls. Their dawn and dusk contact calls carry through standard construction. A detached single-family home with tolerant neighbours is the realistic minimum I'll place one into.
- How long will a Slender-billed Cockatoo live?
With proper diet, veterinary care and husbandry, 40 to 60 years is realistic, and some individuals exceed that. This is a multi-decade commitment — I require every adopter to think seriously about long-term care planning before placement.