Why Chimpanzees Have Big Testes, and Mandrills Have Small Ones
Why Chimpanzees Have Big Testes, and Mandrills Have Small Ones
For primates, males’ fancier ornaments are linked with smaller testes, according to a new comparative study.
Why Chimpanzees Have Big Testes, and Mandrills Have Small Ones
Why Chimpanzees Have Big Testes, and Mandrills Have Small Ones

For primates, males’ fancier ornaments are linked with smaller testes, according to a new comparative study.

For primates, males’ fancier ornaments are linked with smaller testes, according to a new comparative study.

sexual selection
Larger Hermit Crab Penises May Prevent Shell Theft
Larger Hermit Crab Penises May Prevent Shell Theft
Abby Olena | Jan 16, 2019
Members of species with shells they must hold onto for survival have larger sexual tubes than those with less precious private property.
Image of the Day: Beetle Fight
Image of the Day: Beetle Fight
Jef Akst | Dec 3, 2018
The exaggerated horns and elongated forelegs of male flower beetles, which use these appendages as weapons in combat for females, do not slow down the insects in a race.
Image of the Day: Size Matters
Image of the Day: Size Matters
The Scientist Staff, The Scientist Staff | Feb 23, 2018
The male proboscis monkey’s large nose probably evolved in response to female preference and competition between males.
Image of the Day: Glowing Chameleon
Image of the Day: Glowing Chameleon
The Scientist Staff, The Scientist Staff | Jan 23, 2018
The lizards may be signaling one another using fluorescent cues that we can’t see.
The Genetic Strategies of Dealing with High Altitude
The Genetic Strategies of Dealing with High Altitude
Abby Olena | Nov 2, 2017
Andean highlander genomes possess cardiovascular-related variants, while populations from other regions evolved different solutions to manage the lack of oxygen.
Female Fish Select Mates’ Sperm
Female Fish Select Mates’ Sperm
Ben Andrew Henry | Aug 17, 2016
A protective coating on ocellated wrasse eggs helps female fish select sperm from nest-building males.
Scientists Solve Giant Sperm Paradox
Scientists Solve Giant Sperm Paradox
Tanya Lewis | May 26, 2016
A study reveals why some male fruit flies produce sex cells that are 20 times the length of their bodies.
Lizard Swaps Mode of Deciding Its Sex
Lizard Swaps Mode of Deciding Its Sex
Kerry Grens | Jul 1, 2015
Sex assignment in bearded dragons can flip from one based on chromosomes to one driven by temperature, researchers report.
From the Feature Well
From the Feature Well
Jef Akst | Dec 30, 2014
A review of The Scientist’s 2014 special issues, highlighting trending areas of research across the life sciences