Do you hear that? No? You can't. But Isabelle and her Dolphin from Schleich bayala can. Like any dolphin, she can produce very high-pitched sounds called ultrasound. When ultrasonic waves hit an object underwater, the sound wave is reflected as an echo. The dolphin and Isabelle use the echo to find their way in the deep Atlantic Ocean or in the clutter of your desk drawer. Pretty clever, isn't it? That's how the two of them always find their way back to you. And it's a secret language, too. But they don't keep secrets from you. Except maybe which of them is the fastest swimmer. Who do you think it is?