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Rabbit ears are as wide as the body so that they can feel their way in tunnels and not get stuck.
Daniel Kish is a blind American who thaught himself to navigate using echolocation. He and his organization have taught echolocation to at least 500 blind children around the world.
Kish makes palatal clicks with his tongue, - that's a family of click consonants, found only in Africa.I saw a program all about this not that long ago.....he used a clicker of some sort to navigate.....not sure if it was the man you're speaking about. They put them in a room with lots of obstacles high and low and he walked all around it using his clicker and described what was around him as he went. It was just fascinating to watch!