Image of the Day: Spider Sex
Image of the Day: Spider Sex
Funnel-web spiders change the timing of their distinct courtship behavior depending on what microbes they’re carrying.
Image of the Day: Spider Sex
Image of the Day: Spider Sex

Funnel-web spiders change the timing of their distinct courtship behavior depending on what microbes they’re carrying.

Funnel-web spiders change the timing of their distinct courtship behavior depending on what microbes they’re carrying.

reproduction
Image of the Day: Synchronous Spawning
Image of the Day: Synchronous Spawning
Emily Makowski | Sep 9, 2019
Groups of corals release all of their eggs and sperm once a year, but the timing of their spawning is under threat from climate change.
Turtle Embryos May Have a Say in Deciding Their Sex
Turtle Embryos May Have a Say in Deciding Their Sex
Katarina Zimmer | Aug 1, 2019
In a species of freshwater turtle, embryos can move toward warmer or cooler environments within the egg and thus help choose their sexual destiny, but not all experts are convinced.
<em>C. elegans&nbsp;</em>Healthier Without Longevity Gene
C. elegans Healthier Without Longevity Gene
Chia-Yi Hou | Jul 17, 2019
Worms with the reproduction-related TCER-1 gene deleted could fight off infection for longer and survived better when exposed to heat and radiation.
Ecology, Not Physics, Explains Diversity of Insect Eggs
Ecology, Not Physics, Explains Diversity of Insect Eggs
Viviane Callier | Jul 3, 2019
Insect eggs can take any shape at almost any size, refuting explanations for their dimensions based on geometric scaling laws or on relationships between egg traits and adult traits.
Why Chimpanzees Have Big Testes, and Mandrills Have Small Ones
Why Chimpanzees Have Big Testes, and Mandrills Have Small Ones
Katarina Zimmer | Apr 16, 2019
For primates, males’ fancier ornaments are linked with smaller testes, according to a new comparative study.
Image of the Day: Sperm Donors
Image of the Day: Sperm Donors
Carolyn Wilke | Mar 18, 2019
Asexual female nematodes use their male offsprings’ sperm to fertilize eggs, but cast away their genes.
Doctors Report World&rsquo;s Second Case of &ldquo;Semi-Identical&rdquo; Twins
Doctors Report World’s Second Case of “Semi-Identical” Twins
Catherine Offord | Feb 28, 2019
The extremely rare event, thought to be caused by two sperm cells fertilizing the same egg simultaneously, was last reported in 2007.
Image of the Day: Self-Insemination
Image of the Day: Self-Insemination
Carolyn Wilke | Feb 1, 2019
Videos reveal how a female squid fertilizes her eggs—one at a time and without spilling much stored sperm.
Image of the Day: Surprise!
Image of the Day: Surprise!
Kerry Grens | Nov 21, 2018
A 37-year-old simiang gibbon on birth control unexpectedly gave birth at the San Diego Zoo.