The canary and siskin cross was considered infertile for many years just
as are many other canary hybrids. Fortunately it was discovered that
these hybrids were sometimes fertile when crossed back with a canary,
furnishing a new incentive to thousands of canary fanciers now on the
trail of both an all-red and an all-black canary. Today, many fanciers
believe that the introduction of the Black-hooded Red Siskin's blood
will provide the means of producing a red canary. PLATE 30