The signalling function of melanin‐based colouration is debated. Sexual selection theory
states that ornaments should be costly to produce, maintain, wear or display to signal quality …

The feather is a complex ectodermal organ with hierarchical branching patterns. It provides
functions in endothermy, communication, and flight. Studies of feather growth, cycling, and …

Sex differences in life history, physiology, and behavior are nearly ubiquitous across taxa,
owing to sex-specific selection that arises from different reproductive strategies of the sexes …

Age composition is an important population parameter for understanding and managing
endangered species. There are very few studies involving cetaceans in estimating the age …

Highlights•Boldness is repeatable for R. tridactyla and can be considered
personality.•Boldness scores of the mating pair influenced overall reproductive …

Abstract Barn Swallows (Hirundo rustica), a group of passerine birds comprised of six
closely related subspecies, are well known throughout their nearly worldwide distribution, in …

Population divergence in geographic isolation is due to a combination of factors. Natural
and sexual selection may be important in sha** patterns of population differentiation, a …

Female ornaments have long been considered non-functional, but a paradigm shift has
occurred over the 2 last decades. The adaptive nature of female ornaments is now widely …

Aim A current model of rain forest population diversification in Sundaland specifies east–
west vicariance into refugia during the early Pleistocene. In some taxa, this division was …

In males it is frequently testosterone (T) that activates the expression of sexually selected
morphological and behavioral displays, but the role of T in regulating similar traits in females …