The term 'Australian Tree' refers to five different species of trees native to Australia. The Tuart (5 letters) is a tall evergreen tree found in the south-west of Western Australia. The Toon (4 letters) is a small to medium-sized tree found in the tropical and subtropical regions of Australia. The Karri (5 letters) is a tall eucalyptus tree found in the south-west of Western Australia. The Penda (5 letters) is a small to medium-sized tree found in the northern parts of Australia. The Lillypilly (10 letters) is a small to medium-sized tree found in the eastern parts of Australia. All five species are important to the ecology of Australia, providing food and shelter for many animals and birds.