December 15th: Penguins
Birds are special within the animal kingdom, not least because many of them are of those wonderful species where it is easy to tell male and female apart at a glance. Mallard ducks, for example, have a clear and separate plumage colouration indicative of sex, and they are by far from alone amongst our feathery pals. However, some of their kind are less forgiving to the casual bird sexer, as it were. My idea is that penguins should be brought into line with the mallard. Females can retain their familiar colour scheme, but I suggest males could be negatives of that - black where the female is white and vice versa. The only downside of this scheme is that it would require armies of penguin painters to get up close and personal with our fishy chums. Hardly a chore!