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[grahamh]

Mine are wild - they live in all the dams. If you sit by the dam when the light is right you can see them haning in the water just beneath the surface and drifting with the tiniest bit of the head out of the water. Some of the dams have dozens of them - even the smallest which is only about 30 mtres in diameter have four or five. I'll post a piccy of the shell when I go back for it. One thing I do know is that on the few occasions when I've helped them off the road (on their way to a new location) is the smell - they absolutely STINK!.