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Abstract
1. A mating between Black Orpington bantams produced, in addition to blacks, a single female in which the black colouration was replaced by dark chocolate.
2. A mating of the chocolate‐coloured female with a black male, F2 and backcross matings demonstrated that the chocolate phenotype is caused by a recessive sex‐linked gene to which I assign the symbol ∗CHOC.
3. A mating of ‘chocolates’ inter se yielded all chocolate offspring.