Wiktionary
n. 1 A pink and grey species of cockatoo, ''Eolophus roseicapilla'', native to Australia. 2 (context Australia slang English) A fool, an idiot.
Wikipedia
The galah (Eolophus roseicapilla) also known as the rose-breasted cockatoo, galah cockatoo, roseate cockatoo or pink and grey, is one of the most common and widespread cockatoos, and it can be found in open country in almost all parts of mainland Australia.
It is endemic on the mainland and was introduced to Tasmania, where its distinctive pink and grey plumage and its bold and loud behaviour make it a familiar sight in the bush and increasingly in urban areas. It appears to have benefited from the change in the landscape since European colonisation and may be replacing the Major Mitchell's cockatoo in parts of its range.
The term galah is derived from gilaa, a word found in Yuwaalaraay and neighbouring Aboriginal languages.
Usage examples of "galah".
Ursula heard that Boshy had been camped on a far-away creek, waiting for the season of the birdling Galahs.
Using his didgeridoo, a grinning Kuwarra blew a soft honk at a galah winging its way over the chasm.
Sat at the top of his bulging bag: a nineteen-page deposition on his meeting with fourteen-year-old Colleen Galaher in Maam Cross.
Although large game was scarce they managed to catch a bush turkey, goannas and a few galahs that rested in the river gums along the banks of the creeks.
The crimson rosella, the galah, the green grass parrot, the sulphur-crested and the glossy black cockatoos?