"The duck eats bread."
Translation:O pato come pão.
'A pata' is a female duck and the sentence "A pata come pão" should be a correct answer as well.
Whenever this happens, you should just report your answer. They will analyse it and make it available as a correct translation for everyone.
Yeah, I realize that now. I just started a few days ago and am getting the hang of it, but I also wasn't sure if there was some language issue that made A pata wrong is this case.