Como dizer "Vaca-preta" em inglês

Henry,

Além da definição de 'Root beer',não conheço um equivalente em português ou um nome específico para esta bebida.

In Australia this kind of ice-cream drink its called Spider...please don't ask me why!!kkkk...but its true... =D

Interestingly, the "Black Cow" drink exists in English, with a meaning similar to the Portuguese, although the ingredients differ:

"Region appears to dictate the name and contents of this cold, sweet drink. Known as a root beer float, a black cow, a brown cow, and a sassy cow, this all-American favorite is a snap to make. This recipe serves one."

See http://www.ehow.com/how_4094_make-black-cow.html

Now, how do you say "root beer" in Portuguese?

Regards

Good one Donay!

I didn't even know there was an expression like this in Brazil.

All the best.