It is round and white and hard but what is it?

What do you think these are? This was a question asked by a colleague. It turns out they are from a yabby and are called gastroliths or yabby stones.

We think they may have turned up via a white faced heron or another bird which eats yabbies, but couldn’t process the “stones”.

In an article by Roger Thomas in the Courier, he outlines the process

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