I understand the meaning, I think, but it's just an odd situation. A group of people, I imagine, are looking at an animal to whom they have given some food. The speaker sees that it is still hungry and asks the group if anyone has any more food to give it. The scenario leaves much to the imagination, but it would be clearer if the subject of the second sentence were a noun such as "koira" or "hamsteri." [But the adessive case with nouns has not been introduced, so that would not work, I suppose.]
It confused me. At first I thought that the "who" in the question referred to the "it" in the answer (i.e. that the question meant "which of these is having more food" and that the observation was that it is doing so because it is hungry) and was puzzled by the clash of who/it. I think the confusion is actually because "it" is referred to by a pronoun, without establishing what "it" is.