Natural selection
Natural selection is the gradual process by which heritable biological traits become either more or less common in a population as a function of the effect of inherited traits on the differential repr...
Natural selection - Wikipedia
Boxing Match: Watch Female Hare Punch Her Suitors | National Geographic
These hares can pack a punch. Filmed just north of Cairngorn National Park in Scotland, these mountain hares are likely tussling over a mate. But unlike othe...
Calls vs. Balls: "Monkey Balls" Show Why Men Overcompensate
Howler monkeys are about the size of a small dog, weighing around seven kilos, yet they are among the loudest terrestrial animals on the planet, and can roar...
Calls Vs. Balls: Monkeys With More Impressive Roars Produce Less Sperm
Howler monkeys are about the size of a small dog, weighing around seven kilos, yet they are among the loudest terrestrial animals on the planet, and can roar at a similar acoustic frequency to tigers....
Frog study suggests context matters when choosing a mate
The presence of a third option acts as a "decoy effect," inspiring a female frog to consistently select the less attractive of the two original options.
Sexual selection
Sexual selection is a mode of natural selection in which some individuals out-reproduce others of a population because they are better at securing mates. In 1858, Darwin described sexual selection as ...
Sexual selection - Wikipedia
Alternative mating strategy
An alternative mating strategy is a mating strategy used by males or females that differs from the prevailing strategy of the sex. The mating strategies of animals are diverse and variable both across...
Alternative mating strategy - Wikipedia
Koinophilia
Koinophilia occurs when mate-seeking animals preferentially choose individuals that do not have any unusual, peculiar or deviant features. The term was first used by biologist Johan Koeslag. Natural s...
Koinophilia - Wikipedia
Fitness (biology)
Fitness (often denoted in population genetics models) is a central idea in evolutionary theory. It can be defined either with respect to a genotype or to a phenotype in a given environment. In either...
Fitness (biology) - Wikipedia
Animal Coloration (book)
Animal Coloration, or in full Animal Coloration. An account of the principal facts and theories relating to the colours and markings of animals, is a book by the English zoologist Frank Evers Beddard,...
Animal Coloration (book) - Wikipedia
Assortative mating
Assortative mating is a nonrandom mating pattern in which individuals with similar genotypes and/or phenotypes mate with one another more frequently than would be expected under a random mating patter...
Major histocompatibility complex and sexual selection
A pathogen is any agent that causes disease. The body has two defense mechanisms for dealing with pathogenic microorganisms and other harmful substances: the inflammatory reaction and the development...
Major histocompatibility complex and sexual selection - Wikipedia
Sexual conflict
Sexual conflict or sexual antagonism occurs when the two sexes have conflicting optimal fitness strategies concerning reproduction, particularly over the mode and frequency of mating, potentially lead...
Sexual conflict - Wikipedia
Microchimerism
Microchimerism (abbreviated Mc) is the presence of a small number of cells that originate from another individual and are therefore genetically distinct from the cells of the host individual. This ph...
Microchimerism - Wikipedia
The Colours of Animals
The Colours of Animals is a zoology book written in 1890 by Sir Edward Bagnall Poulton (1856–1943). It was the first substantial textbook to argue the case for Darwinian selection applying to all aspe...
The Colours of Animals - Wikipedia
Interlocus sexual conflict
Interlocus sexual conflict is a type of sexual conflict that occurs through the interaction of a set of antagonistic alleles at two or more different loci in males and females, resulting in the deviat...
Interlocus sexual conflict - Wikipedia
Concealed ovulation
Concealed ovulation or hidden estrus in a species is the lack of any perceptible change in an adult female (for instance, a change in appearance or scent) when she is "in heat" and near ovulation. Som...
Cryptic female choice
Cryptic female choice occurs both in pre and post copulatory circumstances when females in certain species use physical or chemical mechanisms to control a male’s success of inseminating them; namely ...
The Descent of Man, and Selection in Relation to Sex
The Descent of Man, and Selection in Relation to Sex is a book on evolutionary theory by English naturalist Charles Darwin, first published in 1871. It was Darwin's second book on evolutionary theory,...
The Descent of Man, and Selection in Relation to Sex - Wikipedia
Operational sex ratio
In the evolutionary biology of sexual reproduction, Operational sex ratio (OSR), is the ratio of sexually competing males that are ready to mate to sexually competing females that are ready to mate, o...
Display (zoology)
Display is a form of animal behaviour, linked to survival of the species in various ways. One example of display used by some species can be found in the form of courtship, with the male usually havin...
Display (zoology) - Wikipedia
Evolution of sexual reproduction
The evolution of sexual reproduction describes how sexually reproducing eukaryotic organisms (animals, plants and fungi) evolved from a common ancestor that was a single celled eukaryotic species. Man...
Female cosmetic coalitions
The theory of Female Cosmetic Coalitions (FCC) is a new and controversial attempt to explain the evolutionary emergence of art, ritual and symbolic culture in Homo sapiens. It is proposed by evolution...
Female cosmetic coalitions - Wikipedia
Female sperm storage
Female sperm storage is a biological process in which sperm cells transferred to a female during mating are temporarily retained within a specific part of the reproductive tract before the oocyte, or ...
Female sperm storage - Wikipedia
Fisherian runaway
Fisherian or Fisher's runaway, first proposed by R. A. Fisher in the early 20th century, is a hypothesized genetic selection mechanism for the evolution of exaggerated male ornamentation (a subtype se...
Fisherian runaway - Wikipedia