The term 'Huge Aussie Birds' can be summed up by the crossword solution of 'Emus' (4 letters). Emus are large, flightless birds native to Australia. They are the second-largest living bird by height, after the ostrich. Emus have long necks and legs, and can reach up to 2 meters in height. They are also known for their fast running speed, which can reach up to 50 km/h. Emus are omnivorous, eating a variety of plants and animals.