The Expression of the Emotions in Man and Animals major revision which made Darwin "sick of the subject and myself, and the world". It quickly sold around 7,000 copies and was widely praised as a charming and accessible introduction to Darwin's evolutionary theories. A second edition was published by Darwin's son in 1890, without several revisions suggested by Darwin; these were not published until the third edition of 1999 (edited by Paul Ekman). Published as a sequel to "The Descent of Man", "The Expression" was assured of a wide readership in mid-Victorian England. However, the early death of George Romanes (1848 - 1894) robbed Darwin of a powerful advocate
Emotion in animals as when rolling and rubbing. Therefore, purring can be generally considered as an indicator of "pleasure" in cats. Low pitched bleating in sheep has been associated with some positive-valence situations, as they are produced by males as an estrus female is approaching or by lactating mothers while licking and nursing their lambs. The argument that animals experience emotions is sometimes rejected due to a lack of evidence, and those who don't believe in the idea of animal intelligence, often argue that anthropomorphism plays a role in individuals' perspectives. Those who reject that animals have the capacity to experience emotion do