What is a Mole, if not a Tiny Dirt Whale? they’re really rather like sperm whales, hunting invertabrates by thier vibrations in total darkness.

Or perhaps a Whale is a very Large Water Mole, with it’s vibration-sensitive organs behind a vibration-amplifying balloon?

The only real difference I can think of between them is that moles don’t have a built-in sonic weapon to the best of my knowledge.