What do these ponies have in common?

[RarityFan01 2,444]

If you are uncertain whether some share a characteristic or not, go ahead and list it. We don't know much about a lot of these characters. Is there any that at least most of them have in common except the fact that they have three of the same cutie mark? 

 

Applejack 

Rarity 

Fluttershy 

Caramel 

Bon Bon 

Cheerilee

Mrs Cup Cake 

Filthy Rich 

Mr Carrot Cake 

Fancy Pants 

Cookie Crumbles 

Hondo Flanks 

 

 

[Sky Knight 1,172]

I was going to say they were all horses.