Ornaments, weapons and aggressive behaviours may evolve in female animals by mate
choice and intrasexual competition for mating opportunities—the standard forms of sexual …

Many animals extract, synthesize and refine chemicals for colour display, where a range of
compounds and structures can produce a diverse colour palette. Feather colours, for …

Highlights•African penguins spontaneously recognize their partner visually.•Penguins rely
strongly on their ventral dot patterns for individual recognition.•Penguins may have holistic …

Why Penguins Communicate: The Evolution of Visual and Vocal Signals is a comprehensive
and condensed review of several hundred publications on the evolution of penguin …

In the context of sexual selection, animals have developed a variety of cues conveying
information about the sex of an individual to conspecifics. In many colonial seabird species …

Mate choice is expected to be important for the fitness of both sexes for species in which
successful reproduction relies strongly on shared and substantial parental investment by …

Males of many animal species express ornaments that affect their reproduction opportunities
through male–male competition or female mate choice. Such ornaments can, for example …

Brain and behavioral asymmetries (termed" lateralization"; eg, preferential eye‐use) have
been mostly described in controlled laboratory conditions, although striking similarities of …

Plumage colour variation occurs widely among bird species and is often associated with
individual fitness. More specifically, colouration can affect thermoregulatory ability, mate …

Reproductive success can improve with experience, which increases with age in many long-
lived species. Signals that provide reliable information about age are therefore of …