Emotion in animals teeth in aggressive action. A domestic dog's simple tail wag may be used in subtly different ways to convey many meanings as illustrated in Darwin's "The Expression of the Emotions in Man and Animals" published in 1872. Evidence for emotions in animals has been primarily anecdotal, from individuals who interact with pets or captive animals on a regular basis. However, critics of animals having emotions often suggest that anthropomorphism is a motivating factor in the interpretation of the observed behaviours. Much of the debate is caused by the difficulty in defining emotions and the cognitive requirements thought necessary for animals
The Man in the Moone la Lune" (1657); Cyrano's traveller actually meets Gonsales, who is still on the Moon, "degraded to the status of pet monkey". It was one of the inspirations for what has been called the first science fiction text in the Americas, "Syzygies and Lunar Quadratures Aligned to the Meridian of Mérida of the Yucatán by an Anctitone or Inhabitant of the Moon ..." by Manuel Antonio de Rivas (1775). The Laputan language of Jonathan Swift, who was a distant relation of Godwin's, may have been influenced by "The Man in the Moone", either directly or through Cyrano de Bergerac. "The Man