There was no specific main animal. It all depended on what story the Aborigines wished to tell through their artwork.
Common animals were snakes, goannas, kangaroos and turtles.
Aboriginal Art
Ainslie Roberts was an Australian artist and writer known for his work on Aboriginal mythology and art. He is most well-known for his collaboration with Aboriginal writer Charles P. Mountford on the book "The Dreamtime" which explores Indigenous Australian stories and culture. Roberts's art often depicted Dreamtime stories and Australian wildlife.
It's actually fairly uncommon to see spirals in Australian Aboriginal art.
John Mawurndjul has written: '<<rarrk>> John Mawurndjul' -- subject(s): Aboriginal Australian Art, Art, Aboriginal Australian, Exhibitions
Indigenous Australian art (also known as Aboriginal art) is art made by Indigenous Australians , covering works that pre-date European colonization as well as contemporary art by Aboriginal Australians based on traditional culture.
Ronald Murray Berndt was an Australian anthropologist known for his work on Indigenous Australian cultures. He wrote numerous books and articles on Aboriginal art, mythology, and social structure, notably "The World of the First Australians" and "Australian Aboriginal Religion".
The animals found on Aboriginal art depend on the native Australian animals found in theur area. kangaroo, koala, crocodile are some examples.
Howard Morphy has written: 'Aboriginal art' -- subject(s): Aboriginal Australian Art 'Becoming Art' -- subject(s): Art and society, Cultural awareness, Historiography, Indigenous art, Yolngu Art
aboriginal art started in the dream-time by indigenous Australian's drawing/painting there culture/lifestyle.
Jack Dale Mengenen has written: 'Jack Dale Mengenen' -- subject(s): Aboriginal Australian Artists, Biography, Aboriginal Australian Art
Vivien Johnson has written: 'Aboriginal Artists of the Western Desert' -- subject(s): Aboriginal Australian Painting, Biography, Dictionaries, Painters, Painting, Aboriginal Australian 'The art of Clifford Possum Tjapaltjarri' -- subject(s): Criticism and interpretation, Catalogs 'Michael Jagamara Nelson' -- subject(s): Aboriginal Australian Painting, Painting, Aboriginal Australian, Themes, motives
Spirals and animals are popular.