I graduated Auburn University with a degree in biology. Through my studies I have noticed on numerous occasions that wild animals can sense disturbances in their environment and respond accordingly. For example, me being a fisherman I've noticed on numerous occasions that bass seem to feed realy heavily right before an approaching storm. I know that they can sense a difference in the water, but who is to say that other animals can't sense some sort of change in their environment as well. Any way, I think it is very possible and does happen a lot, it's just that we do not notice it.