Complex evolutionary dynamics have produced extensive variation in brain anatomy in the
animal world. In guppies, Poecilia reticulata, brain size and anatomy have been extensively …

Behavior, like most other traits, can have a spatial component, and variability of behavior at
the population level is predicted. In this article, we explore male mate choice at this level …

Imminent predation risk affects mating behaviours in prey individuals in a multitude of ways
that can theoretically impact the strength of sexual selection, as well as its operation on …

Sexually selected traits can be costly to produce and maintain. The amount of resources
available to an individual is therefore expected to influence investment in costly sexual traits …

Exaggerated and conspicuous sexually selected traits are often costly to produce and
maintain. Costly traits are expected to show resource-dependent expression, since limited …

Choosing a mate is one of the most important decisions in an animal's lifetime. Female mate
choice is often guided by the presence or intensity of male sexual ornaments, which must be …

Choice and competition are essential parts of evolutionary biology. In an effort to pass their
genes from one generation to the next, animals may carefully choose their mating partners …

The pygmy halfbeak Dermogenys colletei, is known for its viviparous nature, this presents an
intriguing case of relatively low fecundity, raising questions about potential compensatory …