Reproduction

After eight months of hibernation, Arctic ground squirrels emerge in the spring hungry and ready to mate.

Climate Change Is a Wake-Up Call for Hibernating Squirrels

As spring arrives sooner, female Arctic ground squirrels are emerging from their burrows earlier, according to a new study

An image of stem cells on a computer screen from 2010. Stem cells have the potential to develop into various types of cells.

Scientists Create 'Synthetic Embryos' From Monkey Cells

By studying lab-grown stem cells, scientists hope to shed light on miscarriages and birth defects

Yellow crazy ants (Anoplolepis gracilipes)

These Male Ants Have Two Separate Sets of DNA

A genetic condition called chimerism may have helped yellow crazy ants become a dominating invasive species, a new study suggests

Lab-raised cockroaches adapted to maintain their glucose-focused sex lives while still avoiding sugary baited traps set by humans.

Cockroach Sex Is Evolving in Response to Pesticides

A new study highlights the insects' resiliency in spite of human attempts to kill them

Dill, Jalapeño and Gherkin, the three newly hatched radiated tortoises at the Houston Zoo.

90-Year-Old Tortoise Fathers His First Offspring at Houston Zoo

Critically endangered radiated tortoises don’t reproduce often, so this is a win for the species

A male (silver) and female (brown) common European adder meet prior to mating. Scientists are just beginning to understand female sexual anatomy in snakes.

Why Did Scientists Wait So Long to Study the Snake Clitoris?

The delay is representative of a major problem in biology: Female and intersex animals are understudied compared with their male counterparts

Many animals like corals release eggs and sperm into the water on just the right nights of the month.

How Lunar Cycles Guide the Spawning of Sea Creatures

Researchers are starting to understand the biological rhythms that sync worms and corals to phases of the moon

An illustration of Tillyardembia, an earwig-like insect that may have pollinated non-flowering plants some 280 million years ago.

Scientists Discover Oldest Known Fossils of Pollen-Carrying Insects

It’s unclear whether the creatures were pollinating prehistoric plants or just getting a snack

The experimental treatment inhibits an enzyme that is needed for sperm to move.

Male Birth Control Drug 'Stops Sperm in Their Tracks' in Study of Mice

The drug served as a quick-acting, temporary contraceptive with no noticeable side effects, researchers say

Northern quolls are the smallest of Australia's four quoll species.

Too Much Sex and Too Little Sleep Can Kill These Endangered Marsupials

A study finds male northern quolls forgo rest to travel up to 6.5 miles in one night in search of a mate—the equivalent of a human walking 25 miles

Five images display (A) an unhatched egg, (B) a circular outline of a possibly unhatched egg, (C) a compressed egg showing hatching window (arrow) and eggshells collected around the hatching window (circled), (D) an egg showing a curved outline, and (E) a deformed egg showing egg surfaces slipping past each other.

Scientists Uncover Nearly 100 Dinosaur Nests in Fossilized Hatchery

The find reveals that plant-eating titanosaurs had reproductive similarities to both birds and crocodiles

Innovators may want to create soft robots that more accurately replicate the dynamics of an elephant’s trunk.

Seven Scientific Discoveries From 2022 That May Lead to New Inventions

Nature is a breeding ground for innovative solutions to everything from aging to plastic pollution

A reconstruction of adult and newly born Triassic ichthyosaurs Shonisaurus

Paleontologists May Have Solved the Mystery Behind a Prehistoric Reptile Graveyard

Ichthyosaur mothers likely migrated to the site to give birth

An illustration of human sperm.

Human Sperm Counts Declining Worldwide, Study Finds

Researchers disagree on whether the trend has implications for human fertility

Pro-choice protesters in 1972

The Underground Abortion Network That Inspired 'Call Jane'

A new film offers a fictionalized look at the Janes, activists who provided illegal abortions in Chicago before Roe v. Wade

The elkhorn coral is one of the most endangered corals in the Caribbean and the Florida Keys. In Florida alone, the population is reduced by over 95 percent. A coral breeding project using elkhorn coral gametes collected in Florida and Curaçao hopes to give this species a new lease on life. 

This Moonshot for Coral Breeding Was Successful

But the coral are still in tanks, waiting to be released on reefs

A European eel swims in the Baltic Sea. 

The Utterly Engrossing Search for the Origin of Eels

To save the endangered animals, researchers have been working for decades to figure out where they reproduce

A bull walks in front of a cow. If they mate, the bull’s sperm will likely cluster together as they swim through the female’s reproductive organs.

Bull Sperm Get by With a Little Help From Their Friends

Traveling together helps the sperm navigate a tricky, sticky migration through a cow's reproductive tract

Manual breast pump with black bulb, dating to sometime between 1920 and 1959

The Sucky History of the Breast Pump

Efficient, double electric pumps are only 30 years young, but contraptions for expressing breast milk have been around for millennia

Attorney Gloria Allred (left) and Norma McCorvey (right), the anonymous plaintiff in Roe v. Wade, during a pro-choice rally in Burbank, California, on July 4, 1989

Who Was Norma McCorvey, the Woman Behind Roe v. Wade?

Dubbed "Jane Roe," McCorvey sought an abortion after becoming pregnant in 1969 but was thwarted by Texas' restrictive reproductive laws

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