PEACOCKSstrut;bowerbirdsbuildlovenests;spidersgift-wrapfliesinsilk.SuchcourtshipritualsplayanimportantroleinwhatCharlesDarwincalledsexualselection:whenthefemaleofaspeciesbearsmostofthecostsofreproduction,malesuseextravagantdisplaysandgiftstodemonstratetheir“reproductivefitness”andfemaleschoosebetweenthem.Forhumanmales,shardsofacrystallineformofcarbonoftenfeature.Adiamondengagementringsignalsaman’staste,wealthand
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