Sexual selection is a key component of evolutionary biology. However, from the very
formulation of sexual selection by Darwin, the nature and extent of sexual selection have …

For sexual selection to act on a given sex, there must exist variation in the reproductive
success of that sex as a result of differential access to mates or fertilisations. The …

Same-sex sexual behaviour (SSB) has been recorded in over 1,500 animal species with a
widespread distribution across most major clades. Evolutionary biologists have long sought …

The important role that mate choice plays in the lives of animals is matched by the large and
active research field dedicated to studying it. Researchers work on a wide range of species …

Animals often need to invest significantly in mating behaviour in order to successfully mate.
However, the expression of mating behaviour can be costly, especially in unfavourable …

1. Reproductive interference occurs when members of different species engage in
reproductive interactions, leading to a fitness cost to one or both actors. 2. These interactions …

Females that mate with multiple males (polyandry) may reduce the risk that their eggs are
fertilized by a single unsuitable male. About 25 years ago it was hypothesized that bet …

Polyandry, or multiple mating by females with different males, is commonplace. One
explanation is that females engage in convenience polyandry, mating multiple times to …

Infertility is common in nature despite its obvious cost to individual fitness. Rising global
temperatures are predicted to decrease fertility, and male sterility is frequently used in …

The effects of sexual selection are more conspicuous among male animals, and, as a result,
the majority of sexual selection research focuses on males. However, burgeoning evidence …