How does non-human life in an urban ecosystem differ from that in an undeveloped forest ecosystem?

Well i am in middle school but to me i would put that since they are both different ecosystems the undeveloped means that it is like trying to grow otherwise known as developing the forest, but the urban ecosystem is more of an open kind of field like plains type of realm where there is almost no trees or forest. This means that the undeveloped forest is like a semi forest that is trying to still trying to develop. I know i am in middle school but i hope this answers it or helped you find more clues to finding your answer.