Mystery #4Tier 3animals / senses / electricity
How does a shark find a fish hiding motionless under the sand?
A fish lies buried under the sand, holding perfectly still, not making a sound or a ripple. A shark glides overhead, then suddenly turns and digs it straight out. The fish was hidden from sight and from smell. So how did the shark know exactly where it was?
Your guess
What faint clue do you think the shark is picking up?
There's no single magic word to type, have a go in your own words, then reveal the answer to see how close you got.
Make a guess to unlock the hints and the answer.