Bats in the sky

We saw, what we thought were birds, flying toward the ocean.  There were thousands of them flying the same direction for about an hour or so.  We found out they are BIG bats and they fly out at dusk and back in the early morning.  I guess they go out to hunt for food at night.   It's kind of creepy but they don't seem to come down here (unless we just don't know it yet).