"Le farfalle sono sulle mucche."

Translation: The butterflies are on the cows.

[Queedin]

someone else thinking about pasta on cows?

[amoser11]

So the 'the' is built into the word 'sulle'? I just want to make sure I understand this.

[Viaggiatore]

Sulle = su (on) + le (the, fem. pl.)

[JoeM.]

Esattamente! The preposition "su" changes its form in relation to the noun that immediately follows it.

[AliMargot]

I didn't even know 'su' meant 'on'. I must have missed that somewhere along the line.