Background: Sexual selection favours the evolution of male bioactive substances transferred during mating to enhance male reproductive success by affecting female physiology. These effects are mainly
Keratinized tissues, including whiskers, are ideal for acquiring a record of physiological parameters. Unlike other tissues that provide a snapshot of physiological status, whiskers support longitudin
Spermatogenesis is a costly process that is expected to be under selection to maximise sperm quantity and quality. Testis size is often regarded as a proxy measure of sperm investment, implicitly over
