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Sumatras are longtailed like Phoenix and Yokohamas, right?
That's correct. However, they are quite unique. For one thing, unlike Phoenixes, Sumatras have small, tight-fitting peacombs. And for another, many strains of Sumatra (strains that I regard as the most pure) have black skin, almost like the Ayam Cemani of Southeast Asia (do a search here on the Forum for the Cemani, and you will find a post that is particularly interesting and helpful). European strains tend to be lighter skinned, but they have good body type. I personally favor completely black-skinned Sumatras because it makes them unique.
That makes sense. You should be able to discern them from black Yokohamas.