I pulled up google image search and Tyger's eyes widened as he identified the pictures as being what he had found. He yelled for Kalea and she came to have a look, she asked Tyger where he found them, and we all went outside to look at the carport posts. Found one he had missed. Came back inside, looked up cicadas on youtube. Kalea and Tyger were both fascinated by the sounds and Kalea mentioned hearing the sounds before.
We came across this marvellous video which showed the life cyle of the cicada; (NOTE: Those are american cicadas who are seen every 17 years. Australia's cicadas are seen annually)
The rest of the cicada discovery photos we took can be viewed in the Cicadas! set on Flickr. We've identified the live one we saw as Psaltoda magnifica, the Green Baron from this page.
Australian Websites on Cicadas
Enchanted Learning - Cicada print-outs - scroll down page a bit to see them.