Bernd Heinrich, The Nesting Season: Cuckoos, Cuckolds, and the Invention of Monogamy (Harvard UP). Il sesso tra gli uccelli. Da leggere la bella intervista all'autore: "So are birds more biologically inclined to have sex with multiple partners than to be monogamous? Well, you have to talk about individual species. With most birds, the couples break up after the breeding cycle and often re-pair at the next breeding cycle. But that may only be a consequence of them coming back to the same nest site. If somebody else shows up, they'll mate with them instead. And some birds are not at all polyamorous. Ravens, for example, stay in pairs year round. That's unusual."salon.