10 Days, 10 Amazing Facts about Dolphins!
Day 4: Sonar – It is possible that dolphins can read the emotion of other dolphins and “see” through the bodies of other animals using the “x-ray” vision” of their sonar.
This is because dolphin sonar evolved to pass through water and does not reflect until it hits something like bone or air sacs. Since animal bodies are more than 50% water, their sonar enables them to literally “see” inside other animals. (bluevoice)
Learn more about the amazing dolphin here.