I was thinking yesterday that this would be super helpful. I was extending the path around the sides of my flamingo habitat (which has a ring of water around the edge, closest to the fence, with an island of land in the center) and had to remove the water to place the path. After placing the path, I tried to put the water back in, and it said it was obstructed. I moved all the flamingoes away from the water area, I tried pushing the ground out next to the path I had just placed, I tried removing the path entirely, I tried moving the donation bins and education stands. I even tried deleting the trees near the water, in case for some reason that was the issue. It took me at least 10-15 minutes before I finally spotted the one flamingo hiding inside a patch of reeds that I hadn't seen, and, after moving him, the water finally placed again. While yes, that was my bad for not spotting the flamingo in the first place, it should really highlight any obstructions there are. It would save so much time.