While watching bats return home, Hamish notices the cave is very dark and asks 'How do bats see in the dark?' Brewster takes the gang into the cave where they meet Finbar Bat. He shows them how he uses his ears to listen to echoes and move around. Discover answers to questions only young children ask! Through creative thinking, Brewster and Maggie take young viewers on a journey of discovery in a way that will not only entertain, but will get their creative thinking caps on!    Based on the book series `Brewster the Rooster' by Clifford Parrott.