It has an extremely loud and distinctive "haa-haa-haa-de-dah" call—hence the onomatopoetic name. The call is often heard when the birds are flying or are startled, or when the birds communicate socially, for example early in the morning in residential suburbs.
The bird's distinctive call is a loud "haa-haa-haa-de-dah" sound that is often used to communicate while flying, being startled, or during social interactions, particularly in the mornings of suburban neighborhoods.