It's summertime - and very hot - so Bear heads out to the swimming hole in the woods to meet his friends. Someone is making a clatter in the tree, but it isn't Mouse, or Hare, or Badger... Who could it be? The mystery animal hurries down a tunnel and stays underground, not responding to Bear's calls of "Who?" All is revealed when Bear's new friend finally appears (you'll never guess "Hoo"!), recovered from his bout of shyness. Now all the animals can splash around in the swimming hole together!