Tanmay Dixit writes: I am studying the African cuckoo finch, which as its name suggests behaves like a cuckoo: it lays its eggs in the nests of ‘host’ birds, namely warblers. The warblers have evolved to reject eggs of the cuckoo finch, which has resulted in the cuckoo finch accurately forging the complex patterns (‘signatures’) of their hosts. How should hosts respond? I am trying … Continue reading Perfect signatures and perfect forgeries