1. Bats are flying mice. Wood is a tree-based substance.
2. Bats are black. Wood is usually some shade of brown.
3. Bats sink in water. Wood floats.
4. Bats are not useful in making tables and chairs. Wood is.
5. Bats are strict instinctualists. Wood believes in fateful predestination.
6. Bats sleep upside down. Wood doesn't sleep - ever.
7. Bats squeak. Wood whines silently.