 amotz zahavi () (born 1928 in petah tikva) is an israeli evolutionary biologist, a professor emeritus at the zoology department of tel aviv university, and one of the founders of the society for the protection of nature in israel (known as the "spni"). his main works are in the evolution of signals, particularly those that indicate fitness, and their selection. ==biography== amotz zahavi received his ph.d from tel aviv university in 1970. he is married to avishag zahavi, a biologist and a co-investigator. ==scientific career== zahavi is best known for his work on the handicap principle, which explains the evolution of characteristics, behaviors or structures that appear contrary to the principles of darwinian evolution in that they appear to reduce fitness and endanger individual organisms. evolved by sexual selection, these act as signals of the status of the organism, functioning to e. g. attract mates. he expanded it with theories on honest signalling and the idea that selection would favour signals that impose a higher cost, those that are not easily cheated on. ==awards== in 1980, amotz zahavi, together with the society for the protection of nature in israel and two other colleagues, was awarded the israel prize for spni's special contribution to society and the state, for the environment. ==published works== * *{{cite journal | last1 = zahavi | first1 = a | year = 1977 | title = the cost of honesty (further remarks on the handicap principle) | url = | journal = journal of theoretical biology | volume = 67 | issue = 3| pages = 603â605 | doi=10.1016/0022-5193(77)90061-3 | 
1928_births Evolutionary_biologists Israel_Prize_for_special_contribution_to_society_and_the_State_recipients Israeli_zoologists Jews_in_Mandatory_Palestine Living_people Tel_Aviv_University_faculty