Crotalaria cunninghamii, also known as green bird flower, bird flower ratulpo, parrot pea, or regal bird flower, is a plant of the legume family Fabaceae, named Crotalaria after the Greek word for rattle because their seeds rattle, and cunninghamii after early 19th-century botanist Allan Cunningham. Crotalaria cunninghamii is known as Mangarr to the Nyangumarta Warrarn Indigenous group.

Crotalaria cunninghamii is a short-lived perennial plant native to Australia, and its habitat is the deserts, coastlands, drainage lines, and sand dunes of the northern half of Western Australia and the Northern Territory. This habitat is semi-arid to temperate regions in well-drained soils. Crotalaria cunninghamii blooms from January to April. It is pollinated by large bees and by honeyeaters.

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