Young male blue tits are less successful in fathering offspring outside their breeding pair, not because of a lack of experience, but because they are outcompeted by older males, Bart Kempenaers and colleagues from the Max ...
Plants & Animals
Apr 16, 2024
0
83
Male whales along Australia's eastern seaboard are giving up singing to attract a mate, switching instead to fighting their male competition.
Plants & Animals
Feb 16, 2023
0
43
A new study has found the distribution of females in 33 species of Australian rodents affects the evolution of testes size of males in these social species.
Plants & Animals
May 4, 2022
0
87
In a study appearing this week in the journal Nature Communications, a team of researchers led by Christine Drea, professor of Evolutionary Anthropology at Duke University, shows that testosterone-fueled aggression may be ...
Plants & Animals
Dec 17, 2021
0
175
Female zebra finches are choosy but flexible when it comes to finding a mate, allowing them to avoid the fitness costs of being too selective when competition for males is high, report Wolfgang Forstmeier at the Max Planck ...
Plants & Animals
Nov 4, 2021
0
288
It turns out age is no barrier when it comes to reproducing—well, at least for one type of fish.
Plants & Animals
Jul 30, 2021
0
7
Scientists from the Leibniz Institute for Zoo and Wildlife Research (Leibniz-IZW) have found that interacting with other males is more "stressful" for low-ranking than for high-ranking male spotted hyenas. This restricts ...
Plants & Animals
Jan 19, 2021
0
5
Males that face tougher competition for females risk having offspring with a greater number of harmful mutations in their genome than males without rivals. Researchers at Uppsala University have discovered this correlation ...
Plants & Animals
Mar 16, 2020
1
228
New research led by The University of Western Australia has shown that the social conditions that a male experiences while growing up can influence the amount of X and Y chromosome sperm that he produces as an adult.
Evolution
Jul 1, 2019
0
1
The presence of a rival male affects sperm quality, according to a research study led by the University of Alicante and the University of Upsala (Sweden). The work was carried out with adult zebrafish (Danio rerio) and reveals ...
Plants & Animals
Apr 12, 2019
0
27
