Reproduction

Hormone signals help ready worker mole-rats to treat pups as their own.

Eating the Queen's Poop Makes Naked Mole-Rats Better Parents

Hive-minded naked mole-rats work together to care for the queen's offspring, and eating her poop gives them hormones to boost nurturing instincts

Same-Sex Penguin Couple Take a Crack at Incubating an Egg

Sphen and Magic (or ‘Sphengic’) seem to be doing quite well at caring for their foster baby-to-be

Scientists used modified egg and stem cells to create female mice with two mothers. These fatherless mice grew up to have babies of their own (through more typical means of conception).

Scientists Break the Rules of Reproduction by Breeding Mice From Single-Sex Parents

By tinkering with the genes of sperm and egg cells, it's possible to breed mice from two females—and even from two males

Researchers produced the immature egg cells (seen in pink) out of stem cells created using human blood

Scientists Create Immature Human Eggs Out of Blood Cells For the First Time

The lab-grown eggs were not advanced enough for fertilization, but researchers say this next step in the future of reproduction could arrive soon

Sometimes, it's okay to skip leg day.

For Men, Gains in the Gym May Come at a Cost to Sperm

There might be a tradeoff between how strong men look and sperm count

An Andean flamingo looks after a Chilean flamingo chick in a scheme to prompt the birds to breed.

U.K. Heat Wave Triggers Rare Flamingos to Lay Eggs for the First Time in 15 Years

None of the eggs were fertile, but conservation officials have hatched a plan to encourage the flamingos to breed again

Fathers can communicate their priorities through a growing fetus, which can express a set of paternal instructions that increase future care from mothers.

How Dad's Genes Can Prepare Mom for Parenthood

Even fathers who don’t provide childcare to their offspring have a way of securing their kids’ futures—by ramping up mom’s hormones

Ducky day care

Why a Female Duck Was Spotted with a Huge Brood of 76 Ducklings

Think of it as ducky day care

For sperm, there's a vas deferens between start and finish, but the epididymis is what alters these swimmers en route.

Dads Pass On More Than Genetics in Their Sperm

Seminal research reveals that sperm change their cargo as they travel the reproductive tract—and the differences can have consequences for fertility

The science behind the uptick in cheetah births includes a new fecal hormone method to determine pregnancy in the animals.

Zoo Announces Another Seven Adorable Cheetah Cubs Are Born

With wild populations threatened, emerging and new techniques in the breeding science is growing ever more critical

Aggressive or sexual behavior in crows interacting with dead bodies might happen more often when sex hormones run rampant.

It's Not Without Caws That Crows Desecrate Their Dead

What dead crows can teach us about the connections between sex and aggression

Clay's team captured 15 female gnus for study. Following controlled exposure to male mating calls in an experimental setting, the quadrupeds (and their offspring) were released back into the wild.

How Noisy Males Control the Gnu’s Cycle

New research shows that ovulation in Serengeti wildebeests is accelerated and synchronized by the yammering of eager males

Graafian follicle, human ovary

How Artificial Ovaries Could Expand Fertility Options for Chemo Patients

Scientists have taken the next steps toward creating an alternative fertility preservation method using modified ovarian tissue

This scrotal male certainly isn't sheepish.

The Earliest Mammals Kept Their Cool With Descended Testicles

But if free-swinging sperm sacs are the norm, then why did undescended ones evolve four separate times?

Fossil ostracods on a slide from the collection of the Smithsonian’s National Museum of Natural History. The science team behind the recent Nature paper relied heavily on this collection for their analysis.

What the Large Penises of Tiny Crustaceans Tell Us About Evolution

Massive male sex organs have their perks, but in the long run, a little modesty pays

‘Our Bodies, Ourselves,’ the Revolutionary Feminist Health Book, Will No Longer Print New Editions

In the 1970s, the book promoted nonjudgemental discussions about women’s sexual and reproductive health

NASA Sends Human Sperm to the International Space Station

Astronauts will study how microgravity affects the motility of the little swimmers

The mother orca and her newborn calf.

A Male Orca and Its Mother Worked Together to Kill a Newborn Calf

It is the first time that infanticide has been observed among killer whales

Young pythons warm themselves

Study Reveals Pythons Take Care of Their Offspring, For a Little While

The southern African python wraps around its eggs to keep them warm and does the same for its snakelets during the first weeks of life

Will blue packets replace pink ones soon?

Heart-Stopping Arrow Poison Could Be the Key to Male Birth Control

A non-toxic version of the compound interrupts fertilization in rats

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