Rearing into the air to blot out the center sun, the unicorn let out a wail that shook the distant trees. -- Keith Michael Mahan, Dragon Isle (2004) The unicorn bellowed, its sound joining with the woman's scream. -- Jack Yeovil, Genevieve Undead (2002) The waveform of a unicorn's enraged shriek. Note how a series of aftershocks in the middle lead to a fresh round of thunder.