I spoke to Dr. Elizabeth Smith at the Australian Opal Centre in Lightning Ridge about how these bizarre stony lumps inside the head of a crayfish allow the creature to grow as it matures.

I spoke to Dr. Elizabeth Smith at the Australian Opal Centre in Lightning Ridge about how these bizarre stony lumps inside the head of a crayfish allow the creature to grow as it matures. For more information on the Australian Opal Centre, you can visit their Facebook page: https://www.facebook.com/AustralianOpalCentre/ Special thanks to Dr. Elizabeth Smith and the Australian Opal Centre.

For more information on the Australian Opal Centre, you can visit their Facebook page: https://www.facebook.com/AustralianOp...