My friend used to think that there were three different types of cows: vanilla cows, chocolate cows, and strawberry cows. Each cow made a different type of milk. Vanilla cows make vanilla milk, chocolate cows made chocolate milk, etc.
If you bred two types of cows, you would get a totally different one (ex. a vanilla cow and a strawberry cow make a chocolate cow).
Since there were mostly white cows where I am, she thought that there were mostly vanilla cows in the U.S.A, and the other types of cows inhabit different countries.
Interesting theory, but it wasn't true.