Green eggs and ham is a tour of animal sexuality, exploring the effects of sperm competition and sex-based selective pressures on reproductive biology and behaviour. Dr Seuss begins with the history of sperm competition studies, from Darwin's work on sexual selection to Robert Trivers' work on parental investment and Geoff Parker's role as "the father of sperm competition". He also dismantles the wild but much-publicised "killer sperm" hypothesis of Baker and Bellis. Chills.