Figure 1: The relationship between the age of the mother on the date of conception and the tenure of the father. Figure 3: The influence of the number of young female clan members at clan selection on ...

Trivers (1972) proposed that females may choose to mate with males of high sexual competence (the ability to supply sufficient sperm for fertilisation). This hypothesis was tested by allowing ewes in ...

When female sheep get the choice, they would rather mate with a subordinate male than a dominant one. Dominant rams usually mate with ewes much more often than lower-ranking rams do. But they can ...

AbstractThe extent and importance of female mate fidelity in polygynous mating systems are poorly known. Fidelity may contribute to high variance in male reproductive success when it favors attractive ...

For some spiders and the praying mantis, mating is a deadly game, with the pipsqueak males often sacrificing themselves in the name of sex. How a male decides which leggy lady is worth his life, and ...

There’s no such thing as a one-night stand with anglerfish. Marine biologists have just discovered that these toothy, deep-sea creatures possess an unprecedented immune adaptation that allows their ...

Picking a mate isn't easy -- if you are a female iguana. Scientists found that female Galápagos marine iguanas spend a lot of energy picking a mate from a wide range of suitors -- energy they could ...

As a general rule of thumb, most of the world’s wild animals keep their instinctual mating practices within their own species bubble. But if you’re a female plains spadefoot toad, then you just might ...

A number of hypotheses have been proposed for why females eat males before or after mating. After looking at a wide range of data, researchers found that sexual cannibalism may not be a complex ...