Combat traits usually get most of the attention from researchers, because they are thought to have arisen due to intense male-male competition for access to females. Large, elaborate weapons become the focus of sexual selection studies because the connection is obvious. Collared lizards (Crotaphytus collaris), for example, have bite force correlated with head width, and it positively predicts the number of offspring produced in a breeding season, suggesting sexual selection on head morphology and the role of attacking traits.
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