I've never seen a plant run, but I have seen animals run. Why couldn't we assume that the animals headed for higher shelter during the flood? This would explain this quite well.
That would work great if thats what was seen in reality. The problem is that plants are not found at the
bottom and the animals at the
top. If such a simple obsevation was to be found out there, don't you think that people would have noticed?
Had there been a flood I would expect animals to head for higher ground. How would you explain the lack of such an observation?