Studies disagree on the actual number of feline vocalizations, but three categories of sounds generally are recognized: vowels, murmurs and high-intensity sounds.

• The classic — meow — originating in the kitten's plaintive or anxious — mew — contains vowel sounds. Adult cats express variations of this vocalization to state their demands for food or attention, register complaints and convey bewilderment. A slight alteration in tone, pace or punctuation changes the meaning.
  
  
• Murmurs are usually happy sounds, along with purrs, trills and chirrups of greeting or contentment, uttered through closed mouths.
  
  
• The feline's repertoire of high-intensity sounds, such as angry or fearful hissing, spitting, growling and shrieking, is most often directed at other cats. And the ultimate purpose of a female's wail while in heat is to attract males.

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