"The duck eats vegetables."

Translation: Die Ente isst Gemüse.

[ljaschbacher]

I put "Die Ente frisst Gemuese" since for animals it's "fressen" and people it's "essen" but I got it wrong...doesn't make sense

[Lexht]

They may have changed it, or you may have to use the ß. It accepted "Die Ente frißt Gemüse." for me.

[lacow]

You can use "essen" for people and animals.
And "fressen" is not limited to animals. If you use it with a person it changes the meaning to "to gorge" though.
Hope I could help!

[exarcadiaelux]

But it's much more common to use "fressen" for animals, I would not usually use "essen" there. That should be changed.