Imagine you woke up one day and heard the sound of all kinds of animals. You looked outside and saw hundreds of animals marching two by two onto a really large boat. Then imagine that for many years, you had been told that only those people who got on that huge boat would survive a coming rainstorm.
Now stop for a minute and think that up until this very day, not only had it had never rained before, but animals had never gathered together and walked onto a large boat before. How much influence would the fact that animals were gathering have on your belief that the rain was coming?