holes in lawn

any one know what makes small holes in lawn leaving little oval balls of soil that look like animal droppings (like big rat droppings size)? This is in NSW Australia.
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Mechanical core/plug aeration?
http://tinyurl.com/7odqvt8
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wrote:

Anything like a crayfish chimney ?
http://www.google.com/search?q=%22crayfish+chimney%22&hl=en&lr=&as_qdr=all&prmd=imvns&tbm=isch&tbo=u&source=univ&sa=X&ei=5K91T_aGKKHz0gGxxOnbDQ&ved CMQsAQ
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snipped-for-privacy@ccanoemail.com wrote:

http://www.google.com/search?q=%22crayfish+chimney%22&hl=en&lr=&as_qdr=all&prmd=imvns&tbm=isch&tbo=u&source=univ&sa=X&ei=5K91T_aGKKHz0gGxxOnbDQ&ved CMQsAQ
balls of mud
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Does Australia have night crawlers (large earthworms that surface at night)?
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writes:

That would be the culprit if in the SE USA.
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