Apparently people choosing cats from shelters mysteriously overlook the black ones, and so they are unnaturally difficult to find new homes for, and make up 23% of Cats Protection's waiting refugees. National Black Cats Day is intended to make people aware of this and encourage them to choose more black cats
Lucy Pinder on black cats:
I was really surprised to hear that black cats take longer to find homes - it’s such a shame. Black cats make just as good pets as the more colourful moggies and often have particularly striking and noble looks so I'd recommend adopting a black cat to anyone thinking of getting a cat.