The term 'Grounded Australian Birds' refers to two species of birds native to Australia, the Emu and the Cassowary. Emus are the largest bird in Australia and the second-largest bird in the world, standing up to 2 meters tall. They are flightless birds that live in open grasslands and woodlands, and feed on a variety of plants and insects. Cassowaries are also flightless birds, but are smaller than Emus, standing up to 1.5 meters tall. They inhabit tropical rainforests and eat a variety of fruits, seeds, and fungi. Both species are important to the ecology of Australia, as they help disperse seeds and maintain the balance of the ecosystem.