Digital Reptiles,
...Like you said it seems to be related to mood or something. It happens most often at night and most often with young newly mature females though to some extent it does occur with all ages and both sexes. It also occurs very markedly in Colombian and Campina Grande Rainbows. It is much less noticeable in my Peruvian Rainbows and I have never seen it in my Isla Marajo and Argentinian Rainbows.
Jeff

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