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Whole-body effects were similarly clear in animals: castrated cock chickens (capons) did not develop the typical male secondary sexual characteristics, namely aggression, crowing, muscle development, sexual proclivity and most visibly the cockscomb and wattle; they were docile and developed tender flesh, which was considered a delicacy.
Chickens from the Harappan culture of the Indus Valley (2500–2100 BC) may have been the main source of diffusion throughout the world." Also, "Within the Indus Valley, indications are that chickens were used for sport and not for food (Zeuner 1963)", cited in R.D. Crawford (1990). and that by 1000 BC they had assumed "religious significance".
Isolated and domesticated llamas are more likely to have berserk llama syndrome. Berserk llama syndrome (usually shortened to BLS), aberrant behavior syndrome, or berserk male syndrome (as it is more pronounced in males) is a psychological condition experienced by human-raised camelids, particularly llamas and alpacas, that can cause them to exhibit dangerously aggressive behavior toward humans.
He lists a variety of aggression categories, each separately subject to natural selection, and states that aggressive behavior is, genetically, one of the most labile of all traits. He maintains that aggression is a technique used to gain control over necessary resources, and serves as a "density-dependent factor" in population control. He ...
Live capons in Hainan, China, displaying characteristic small head, comb and wattle. A capon (from Latin: cāpō, genitive cāpōnis) is a male chicken that has been castrated or neutered, either physically or chemically, to improve the quality of its flesh for food, and, in some countries like Spain, fattened by forced feeding.
Training chickens has become a way for trainers of other animals (primarily dogs) to perfect their training technique. Bob Bailey, formerly of Animal Behavior Enterprises and the IQ Zoo , teaches chicken training seminars where trainers teach poultry to discriminate between shapes, to navigate an obstacle course and to chain behaviors together.
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Aggressionism is a philosophical theory that the only real cause of war is human aggression, which refers to the "general tendency to attack members of one's species." [1] It is argued that aggression is a natural response to defend vital interests such as territory, family, or identity if threatened. [1]