In the Reserve I have sometimes come upon the Iguana, the big lizards, as they were sunning themselves upon a flat stone in a river bed. They are not pretty in shape, but nothing can be imagined more beautiful than their colouring. They shine like a heap of precious stones or like a pane cut out of an old church window. When, as you approach, they swish away, there is a flash of azure, green and purple over the stones, the colour seems to be standing behind them in the air, like a comet s luminous tail.- In the Reserve I have sometimes come upon the Iguana, the big lizards, as they were sunning themselves upon a flat stone in a river bed. They are not pretty in shape, but nothing can be imagined more beautiful than their colouring. They shine like a heap of precious stones or like a pane cut out of an old church window. When, as you approach, they swish away, there is a flash of azure, green and purple over the stones, the colour seems to be standing behind them in the air, like a comet s luminous tail.