Occasionally, a genetic defect creates rare types of colouration. An albino animal lacks pigment in the skin, whereas a leucistic animal lacks melanin but retains some pigment. This Siamese crocodile is hypomelanistic, which means it has less melanin than normal, and is therefore much lighter - almost yellow on the dorsal surface. Several scars are also evident on this animal's head - usually indications of fighting over resources, territory, or breeding rights.
Photograph © Adam Britton
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