The Swift Parrot is a slim, medium-sized parrot with a streamlined shape in flight, angular pointed wings and a long pointed purple-red tail. The body is mostly bright green, with a dark blue patch on the crown. The forehead to throat is crimson and there is a crimson patch at the bend of the wing. The female is slightly duller, with a creamy underwing bar. In flight, the bright green body, dark flight feathers and scarlet underwing linings and undertail coverts are spectacular. They are noisy, active and showy, with a very fast, direct flight.