A zoo (short for zoological park, zoological garden, or animal park, and also called a menagerie) is a facility in which animals are confined within enclosures, displayed to the public, and in which they may also be bred.

• Nowhere in a zoo can a stranger encounter the look of an animal. At the most, the animal’s gaze flickers and passes on. They look sideways. They look blindly beyond. They scan mechanically. … That look between animal and man, which may have played a crucial role in the development of human society, and with which, in any case, all men had always lived until less than a century ago, has been extinguished. Looking at each animal, the unaccompanied zoo visitor is alone.
  • John Berger, About Looking (1980), chapter "Why Look at Animals?"

• The zoo animal in a cage exhibits all these abnormalities that we know so well from our human companions. Clearly, then, the city is not a concrete jungle, it is a human zoo.
  • Desmond Morris (2009), The Human Zoo, p. vii

• The directory of animals in the zoo ranges all the way from aardvark to zebra.
  • Bernard Livingston (1 November 2000). Zoo: Animals, People, Places. iUniverse. p. 205. ISBN 978-0-595-14623-9.