No clue what this is - my parents sent me this photo with description. It's sitting in a 2L ice-cream container and this is around 40cm long with a yellow tipped tail. It was one of two and found on the shoreline in Matai Bay. It appeared to be air breathing and had no visible fins or gills like fish or eels. When they were released they were put in the surf but the waves receded so they buried under the sand. Sorry, it's the only photo I have. Very curious.
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Dead, found on rocky shore, large crab