The strangest thing has happened to me, or at least I feel weird.

I'm relatively new to this, and about a week ago I decided to start stat breeding my Unicorns.
I had one female Chestnut Zebra to start with and - my first try got me a Pink Zebra baby. Ok, I thought, the dad was Gray Zebra, really lucky!

But today my Chestnut's second daughter gave birth to - another Pink Zebra, and this time not even one of the parents were Gray Zebra.

Two unintended deviants out of three would be great, but: 

1. I'm picky and don't feel like keeping pink zebras.

2. Noticing, that there are more than few males of the same kind in Breeding Offers section, I'm wondering if this particular deviant is really rare at all?

So are the Pink Zebra Unicorns that common? Or did I actually get that riddiculously lucky?

There's the same chance of getting a deviant of any color when you pick the right parents. It's 1/10 for any homozygous child unless you icreased it with a DCA item that was available about a month ago on one of the Warlock events. So yeah, you were pretty lucky to get your pink zebras, especially if to take into account that mother was heterozygous, and for her it was 1/20 or 1/40 chance depending on the father's genetics. 

Well, I didn't enhance the chances, and I'd read the 1/10 rule, but some deviants seem to appear more often than others, or is it just me?

Also, the frst pet I ever bred here was deviant but had heterozygous parents (I was sooo confused when gray and brown Rocs bred a yellow one).
So I was starting to wonder if there was something super special secret going on.

I guess there is not then, just luck. Ok. Wow. Thanks. :)

Motacilla, the parents don't have to be homozygous for a single-trait deviant. It's a requirement for a double-trait deviants.

From the mechanics side we have one global chance for getting a deviant instead of a normal homozygous color or pattern. Plain and simple, no secret modifiers here. It doesn't depend on any genes, stats or anything else except the item that birdlove mentioned. Of course, there's a different number of breedings for pets with different color due to the natural rarity of colors and player preferences. Some players tend to breed more pets with a certain color because they like it more, and other players pay more attention to factors that aren't related to color, and ending with a genetic line that have a narrow color range. A certain deviant color may turn out the most widespread due to these factors.

Yes, I know they don't have to be homozygous (I have done some reading on the topic since starting), it's just a much smaller chance, like birlove said.

Now that I think about it, what you say, Angel, makes perfect sense, but at first it seemed too many coincidences, so I figured it's better to check.

Thanks for explaining though!