The changes in colour between the pictures are caused by the use of a torch (flash light to some!) to get a better look. You may ask why we were doing this. Its hard to tell from the pictures just how dark it was at this time - and it really does show the light gathering power of the high ISO speeds on digital cameras - but you can also see the grain in the picture.
You can find a longer account of my boat trips on the Daintree River here.
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