That is a very dark 'normal' colored Nile. Virtually all of ours are lighter than the dark animal in that photo. The only animals we have that remain that dark are animals that have ancestry in West Africa.

The Madagascar version is a nice blend of black and yellow and our east and south guys are more yellow.

A croc farm we consult with in Africa is able to increase the yellow color(sometimes markedly so) of the hide by feeding more maize to the animals. SO we are not convinced it is a totally genetic condition although clearly that the case in some of them.
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CDieter
'Reason, observation, and experience; the holy trinity of science.'

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