I totally believe they can sense something different, maybe the air pressure dropping when a front goes thru, or? I'll definitely be paying attention to see
if I notice anything similar during our next big storm, but it's been a while- lately storms have been mostly dancing around my area.On the other hand,
there is also the very human phenomenon of "seeing that which we expect to see" so what we really need is some good independent research done. It
would certainly favor their survival though, if they had the ability to detect major storms and get to high ground or give birth etc.