relations, an ear for the difference between these two sounds will stand the unicorn seeker in good stead. With its lingering echoes, vocalized unicorn laughter may be heard up to three miles away. Its tone varies: strangely playful like chuckles from within a hall of mirrors silvery, like tinkling wind chimes or breaking glass primal, perhaps even eerie rich and warm high-pitched, piercing low whinnying dry like wet pebbles tumbling down a hillside joyful, ebullient deep growling or snarling staccato mocking spontaneous wild and wonderful bubbling over, as if water has gone up one's nose hollow moaning rapid fire barking Voiceless unicorn laughter is akin to Franz Kafka's description of "the sort of laughter that can be produced without lungs. It sounds something like the rustling of fallen leaves" ("A Country Doctor," 1919). Like the bonobo, voiceless unicorn laughter "sounds like the laughter of someone who has laughed so hard that he has run out of air but can't stop laughing anyway" (Sue Savage-Rumbaugh and Roger Lewin, Kanzi, 1996).