A crystal clear rainforest stream........the best place for Christmas lunch on a hot day, and as a special treat a Giant Spiny Crayfish walked past our table near the stream. One of the largest freshwater mountain crays, this one was about 180mm. They occupy specific microclimates and are very prone to changes in their habitat. Mountain crayfish on the east coast are still being identified, will we find all species before climate change affects their lifecycle?