I'm having a LOT of trouble with this campaign - it's one of the only three I have remaining. I've played it three times now. The first time I was nowhere near completing when the clock ran out, but the second and third time it literally came down to ONE thing. I had to adopt ONE more child endangered animal, and both times I couldn't do so even after selling everything because they're just so expensive. I ended up running the clock out with about 5k left and I hadn't realized a baby rhino was going to run me 20k.
So, I guess my question is, what are the cheapest endangered species?
Is there a particular strategy to this campaign? There isn't nearly enough time or money, it seems.