L. W. and B. Y. constructed linkage maps. F. , Y. W. , and H. P. set up mapping families and cultured fish. L. Artificial preference and experimental evolution are successful tools for trying out proximate and ultimate causes of behaviour. These manipulations may be carried out under controlled circumstances in laboratory or natural settings or arise from unintentional herbal experiments. Domestication is a particularly interesting example as it usually combines variant to captive conditions and selective breeding for specific traits . The comparison among domesticated and wild type traces was key to Darwin’s theory of herbal option and since then it has enriched our understanding of the regular mechanisms of behaviour and its evolutionary concepts . Studying organisms that experience been under strong synthetic preference for certain behavioural traits may facilitate the identity of genetic and physiological mechanisms underlying the expression of that behaviour e. g.