I would think a location in Victoria and the Dividing Range near Sydney are the hottest locations for "black panthers"!

Funny, none are ever just spotted!

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I think Capstick mentioned in a book, for what it is worth, that he thought Jaguars were more common as black than leopards.

Also just a guess wouldn't they be more genetically likely in heavier forest/jungle regions than more open savannah/bush?