The Australian coat of arms features kangaroos and emus, animals that cannot walk backwards, representing the states and territories of Australia. The Australian flag uses blue, white and red to symbolize justice, peace, bravery and other values, and features small stars of the Southern Cross and a larger star for the states. Convicts were sent to Australia starting in the 1700s when Captain Cook declared the land uninhabited, and many also fled there during World War II or sought opportunity during gold rushes, helping drive migration to Australia. Aboriginal culture centers around spiritual beliefs, traditions, tools, and their flag incorporates red earth, black and yellow symbols.