The ability of feathers to perform many functions either simultaneously or at different times
throughout the year or life of a bird is integral to the evolutionary history of birds. Many …

Rapid divergence and speciation can occur between populations with or without ecological
differences under selection for success in intraspecific social competition-competition in …

It has been argued that females should be able to choose parasite-resistant mates on the
basis of the quality of male secondary sexual characters and that such signals must be …

Why are animal signals reliable? This is the central problem for evolutionary biologists
interested in signals. Of course, not all signals are reliable; but most are, otherwise receivers …

Ever since Darwin, animal behavior has intrigued and perplexed human observers. The
elaborate mating rituals, lavish decorative displays, complex songs, calls, dances and many …

Humans in societies around the world discriminate between potential mates on the basis of
attractiveness in ways that can dramatically affect their lives. From an evolutionary …

Secondary sexual characters in many species function both in male-male competition and
as cues for female choice. Based on a literature compilation of existing knowledge of traits …

Songs are complex acoustic signals produced mainly during the mating season. Such
signals are found in many taxa but are most typical of birds, frogs, and insects. Darwin (38) …

An evolutionary theory of self‐deception‐the active misrepresentation of reality to the
conscious mind‐suggests that there may be multiple sources of self‐deception in our own …

Research conducted in the last fifteen years has placed in question many of the traditional
conclusions scholars have formed about human female sexuality. Though conventional …