Galah (Eolophus roseicapilla) female and male, Cape York Peninsula, Australia

The galah, also known as the pink and grey cockatoo or rose-breasted cockatoo, is the only species within genus Eolophus of the cockatoo family. Found throughout Australia, it is among the most common of the cockatoos. Wikipedia

Galahs are monogamous, they will stay with the same breeding partner for life.

Very commonly in Australian English galah is used to refer to a fool or idiot. This figurative sense is recorded from the 1930s, and derives from the perceived stupidity of the bird. The following quotations give an indication of how the term is used:

1951 E. Lambert Twenty Thousand Thieves: 'Yair, and I got better ideas than some of the galahs that give us our orders'.

1960 R.S. Porteous Cattleman: 'The bloke on the other end of the line is only some useless galah tryin' to sell a new brand of dip'.

1971 J. O'Grady Aussie Etiket: 'You would be the greatest bloody galah this side of the rabbit-proof fence'.

Via: Meanings and origins of Australian words and idioms

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