From what I've read calico cats are usually all females. Does it mean male calicos do not exist at all?
thats not true. it may seem that most of them are female but then again you may ask how come they give birth to young ones if they arent bred with their males? so male calico cats really exists.Emotion: smile

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Taken from wikipedia:

Calico cats are almost always female because the X chromosome determines the color of the cat and a female cat has two X chromosomes. A common male cat has one X and one Y chromosome. Since the Y chromosome does not have any color genes, there is no chance he could have both orange and non-orange together. One main exception to this is when, in rare cases, a male has XXY chromosomes, in which case the male could have tortoiseshell or calico markings.

I hope it helps.