Cacatua leadbeateri
Major Mitchell's cockatoo
(Also: pink cockatoo)

Cacatua leadbeateri is endemic to Australia and inhabits interior central and southwest areas. The subspecies C. l. leadbeateri can be found in eastern Australia, whereas the subspecies C. l. mollis is found in central and western Australia. ("Major Mitchell's Cockatoo", 2009; Forshaw and Knight, 2010; ; ; Rowley, 1991; del Hoyo, et al., 1997)

Cacatua leadbeateri lives in arid to semiarid regions with nearby water sources. These birds inhabit scrublands, wooded grasslands, and savannas but rely on forested areas for nesting habitat. They require tall, hollow trees to nest in. They prefer areas with Callitris, Allocasuarina, and Eucalyptus plants for foraging and will roam nomadically to find adequate food resources. Cacatua leadbeateri inhabits inland Australia, but is never far from a water source. ("Major Mitchell's Cockatoo", 2009; ; Forshaw and Knight, 2010; ; ; del Hoyo, et al., 1997)

Cacatua leadbeateri is a small to medium size bird weighing 300 to 450 grams. They range from 35 to 40 centimeters long with a wing span of roughly 81 centimeters. Cacatua leadbeateri is a distinctively colored species, and is often referred to as the "pink cockatoos". These birds have a white back, tail, and wings. Its breast, head, and stomach can vary in color from pale salmon to robust pink. The underside of the wings and base of the tail is similar in color to their breast and stomach, but often richer and deeper in color. Just before the crest is a white patch of plumage with a red frontal band above the bill. Cacatua leadbeateri is most known for its prominent crest. The crest is banded red-yellow-red with white tips. The crest’s bands can help to distinguish the two subspecies. Subspecies C. l. leadbeateri has a more prominent yellow band while subspecies C. l. mollis has little to no yellow in the crest. Their feet are gray. Cacatua leadbeateri has a very strong bill which is off-white or pale beige in color and decurved at the very tip. Its eyes range from dark brown in males to a lighter reddish brown in females.

Females are very similar to males in plumage, except that their plumage is duller with a white upper belly. Their crest may have a slightly larger yellow band than males. The females are also slightly smaller. Juveniles resemble females but with even paler plumage, light brown eyes, and duller frontal band. ("Major Mitchell's Cockatoo", 2009; ; Forshaw and Knight, 2010; ; ; del Hoyo, et al., 1997)

Cacatua leadbeateri is a monogamous species and forms life-long pair bonds. Courtship consists of visual displays where the male struts while bobbing his head, swaying, and lifting his wings for the female. The female raises her crest and bows in response, and the two softly chatter to each other. If the female accepts him they proceed to allopreen and occasionally feed each other. (; ; del Hoyo, et al., 1997)

The breeding season for Cacatua leadbeateri typically begins in August and lasts through December, but some northern populations can begin breeding as early as May. Cacatua leadbeateri is a cavity nesting species, and selects a hollow 3 to 20 m above ground, preferably in a eucalyptus tree near water. This species is unable to excavate new cavities and relies on natural hollows or those constructed by other species. Both male and female construct the nest by gathering bits of wood and pebbles. The same nest is often used year after year. Pairs are very territorial and must nest at least one kilometer from other breeding pairs. Two to five eggs are laid at an interval of one every 2 to 3 days. Incubation lasts 23 to 30 days and the young remain in the nest for six to eight weeks before they fledge. Parents, mostly the male, continue to feed fledgelings for 8 additional weeks. Juveniles join their parents to form small, family groups that remain together for some time after the young reach independence. Juveniles reach sexual maturity at 3 to 4 years of age. (; ; del Hoyo, et al., 1997)

Cacatua leadbeateri is very territorial during the breeding season, and likely expends significant energy defending its large territory of 30 square kilometers. Both the male and female participate in gathering nesting materials. After eggs are laid, both parents take turns incubating the clutch, with the male generally brooding during the day and the female at night. Chicks are born altricial, without feathers and with eyes closed, and require significant parental care. Parents tend to the chicks while in the nest for six to eight weeks until they fledge. They will continue to be fed by the parents, primarily by the male, for another 8 weeks when they reach independence. Juveniles often remain with the parents to form family groups. (; ; del Hoyo, et al., 1997)

Cacatua leadbeateri is a long-lived species. They live to be 50 to 60 years old in the wild. The oldest known bird of this species is an individual named "Cookie" who lives at the Brookfield Zoo and as of June 2010 was 77 years old. ("Cookie Cockatoo Celebrates 77th Birthday", 2011)

Breeding pairs are very territorial, and will not nest closer than 1 km to another nesting pair. During the non-breeding season pairs often interact with many other pairs creating flocks of 10 to 50 birds. They can often be seen with other cockatoo species including galahs (Cacatua roseicapilla) and little corellas (Cacatua sanguinea). Cacatua leadbeateri is a diurnal species. During the day these birds can be found on the ground or in trees often foraging for seeds. They are weak fliers, and are characterized by slow, labored, low altitude flight. This species will often fly short distances and rest before taking flight again. They are mainly a sedentary species, and will perform local migrations in search of food resources. (; ; del Hoyo, et al., 1997)

Nesting Cacatua leadbeateri defends a territory of 30 square km.

Cacatua leadbeateri has a characteristic “creek-ery-cree” call that can be heard at incredible distances. As in most cockatoos, the frequency of the call acts as a mood indicator with more frequent call characterizing stress. It uses a soft contact call, with a frequency of one call per minute, when foraging and even softer calls when it is about to feed its young. Their crest is also used to visually attract a mate, ward off opposing males, and communicate alarm or distress to nearby birds. As part of the mating rituals, males will visually display to females with head bobbing, body swaying and wing raising. Mated pairs use allopreening to reinforce their lifelong bond. Like all birds, Cacatua leadbeateri perceives its environment through visual, tactile, auditory and chemical stimuli. (; Forshaw and Knight, 2010; del Hoyo, et al., 1997)

Cacatua leadbeateri feeds on seeds, nuts, grains, fruits and tubers. They often select habitats that feature trees of the genus Callitris, Allocasuarina, Acacia and Eucalyptus to forage on. They forage both in the trees and on the ground. Their large bills aid in cracking open thick-shelled nuts and seeds, as well is breaking open tree branches to access insect larvae. These cockatoos may turn to agricultural grains when native food resources are in short supply. (; ; ; del Hoyo, et al., 1997)

Local species of falcons and eagles are predators to Cacatua leadbeateri. Red foxes and cats also prey upon this species. (Forshaw, 1978)

Cacatua leadbeateri consume fruit and seeds of many native plants and likely serve as an important seed disperser for Australian ecosystems. (del Hoyo, et al., 1997)

Cacatua leadbeateri is a beautiful and charismatic species and likely brings ecotourism to areas it inhabits. They are also a popular captive pet.

There are little negative effects of Cacatua leadbeateri on humans, but when food resources are scarce birds may feed on agricultural crops. (Forshaw, 1978)

Cacatua leadbeateri populations have been declining in recent years due to habitat loss and fragmentation. Much of its forest habitat has been cleared for farms and agricultural fields. These birds nest in tree hollows, but are unable to excavate cavities themselves and thus rely on natural hollows or those constructed by other species. The harvesting of old-growth forests has drastically decreased the number of natural tree cavities for nesting. The IUCN Red List categorizes this species as of least concern although many local efforts have been made to support the species. Because of this species' high market value in the pet industry, populations are threatened by humans who illegally collect eggs, chicks, or adults. These birds are often hesitant to fly across open, tree-less habitats, thus efforts are underway to create vegetation corridors to increase habitat connectivity. Cacatua leadbeateri occasionally feeds on agricultural crops, and illegal persecution by farmers is common as removing several other, similar species of cockatoo is legal. Local efforts are being made to increase public awareness and understanding of this endemic species. (; "Major Mitchell's Cockatoo", 2009; ; del Hoyo, et al., 1997)