Halloween crested geckos are harlequins with black and orange markings. Yellow, gold and cream colouring will not be visible on this gecko, this includes the geckos tail. 
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The Halloween’s head only displays orange and black colouration.
Halloween’s bodies only displays orange and black colouration.
The belly is unaffected by this trait.
The Halloween’s tail only displays orange and black colouration.
Halloweens only have the two colours throughout their body. As portholes are raised areas of unfinished pigmentation, a Halloween displaying them could also be classed as a Halloween, however some breeders disagree.
No known proven lines
No known related traits