Are all orange tabby cats male and are all calico cats female?

Hear the science behind uncommon female orange tabby cats and the extremely rare tortoisehsell or calico male cat.

By Arnold Plotnick, DVM | Updated: January 17, 2013, 2 p.m. EST

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Orange Tabby Cats

Q: I have heard that all orange tabby cats are male, and to find one that is female is rare and worth up to $1,000. I also have heard that calico cats and tortoiseshell cats are female and to find a male is just as rare and prized. Is there any truth to this?

A: Your first statement is incorrect. Most, but certainly not all, orange tabby cats are male. Orange tabby cats are about 80/20 male to female. We have many female orange tabby cats in my practice. There is no monetary value, per se, associated with a female orange tabby cat. Calico and tortoiseshell cats, however, are almost always female.

Here’s how it works. To have black and orange in the same cat, the cat needs two X chromosomes. Two X chromosomes mean the cat will be female. Male cats need a Y chromosome and are XY.

Occasionally a mutation will arise during embryonic development and a kitten will be born with an extra chromosome: XXY. The two Xs allow for the cat to be black and orange. The Y makes it a male. This is how you get a tortoiseshell or a calico male cat.

Tortoiseshell and calico male cats are uncommon (one out of 3000 are male), but don’t get your hopes up about breeding these rare cats for money. As a result of this mutation, most tortoiseshell and calico male cats are sterile.

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Reader Comments

Lois    Louisville, AL

10/2/2014 10:29:49 PM

I have 11 Orange Tabby cats..7 are male and 4 are female

Grandma    Atlanta, GA

9/3/2014 9:58:29 PM

Since the calico and tortoise males are sterile, does that mean you don't have to neuter them?

Shelia    Midlothian, VA

9/3/2014 7:20:08 PM

I had an orange tabby cat that was a female. I was told that most of the time they are male and most of the time calico cats are female.

Carole    International

9/3/2014 3:31:31 PM

This has always been the case & here in NZ what was once a really rare thing To find an Orange Tabby female...They are becoming really prevalent these days...I have no idea as to why...I myself have three calico "gorgeous gussies"...a seal point male & a white female...(all neutered )of coarse...

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