Sexual selection theory has provided explanation for the evolution and function of elaborate
male traits, yet less effective in explaining female trait expression. Consequently, there …

Cryptic female choice (CFC) is a component of postcopulatory sexual selection that allows
females to influence the fertilization success of sperm from different males. While its precise …

Extrapair fertilizations (EPFs) are an important component of many socially monogamous
mating systems. However, information about the reproductive tactics used by male and …

Variation in ecological and demographic characteristics may alter the value of extrapair
paternity (EPP) for socially monogamous species, thereby leading to variation in mating …

Extra-pair fertilizations are common in many socially monogamous species, and paternity
studies have indicated that females may use male vocal performance and plumage …

Sexual signals are often diagnostic of closely related species, and their taxonomic value at
higher phylogenetic levels is often discussed. Complex signals such as birdsong are …

Sexual signals can comprise traits with multiple functions, and species with extreme
phenotypes offer an opportunity to link function with signal evolution. This is the case in the …

Extrapair mating strategies are common among socially monogamous birds, but vary widely
across ecological and social contexts in which breeding occurs. This variation is thought to …

Male mate guarding by close following has been reported in many socially monogamous
bird species and is generally believed to function as a paternity guard. Many aspects of the …

This chapter uses research with various canary relatives to explain the use of song and
colour ornamentation as communication signals, especially in the contexts of mate choice …