Bears are in, but in caves there must also be bats. My idea with bats, is that they will swoop you and possibly latch on. The latch-on lasts a few seconds and slows you down, but also makes it more likely for other bats to latch on. If you ever end up with too many bats latched on, you die!
Bears turned out *just grandly*, so I'm excited for bats, today.