Reproduction

The Octopus bimaculoides, or the California two-spot octopus

Scientists Figure Out Why Female Octopuses Self-Destruct After Laying Eggs

A new study finds several biochemical pathways, including one that produces a precursor to cholesterol, may be key to this behavior

Demonstrators at a pro-choice march in April 1989

In 1973, a Leak at the Supreme Court Broke News of an Imminent Ruling on Roe v. Wade

Nearly 50 years later, a similar disclosure revealed that the court is poised to overturn legalized abortion in the U.S.

Biologists of the past often explained the vast spectrum of animal genitalia with "lock-and-key": the hypothesis that vaginas and penises had primarily evolved to fit into each other mechanically. Today, there is a growing appreciation for the myriad of forces acting on genitals.

Why Have Female Animals Evolved Such Wild Genitals?

From ducks to dolphins, females have developed sex organs that help them deter undesirable suitors and derive pleasure from non-reproductive behavior

A rare sighting of a northern spring salamander on migration night. These nocturnal creatures spend their days hiding under logs and stones.

Why Did the Salamander Cross the Road?

To reproduce, of course. And a band of volunteers gathers at night to help it—and countless other amphibians—get to the other side

Researchers are getting closer to creating a birth control pill for those with testes, according to findings presented this week at a meeting of the American Chemical Society.

Male Birth Control Pill Expected to Start Human Trials This Year

The new non-hormonal pill was 99 percent effective at preventing pregnancy in mice

Bottlenose dolphins swim in the Moray Firth Special Area of Conservation off Scotland. The photo was taken by an aerial drone.

In a First, Scientists Use Drones to Detect Pregnant Dolphins

Researchers say the new tech will help them better understand bottlenose dolphin reproduction

The parthenogenetic mouse and the offspring

Mice Birthed From Unfertilized Eggs for the First Time

The lab rodent, which only had genes from its mother, grew to adulthood and successfully reproduced, which was thought to be impossible in mammals

Fetal alcohol spectrum disorders could affect between 1 and 5 percent of children in the United States.

New Tools May Help Diagnose Fetal Alcohol Spectrum Disorders

If conditions stemming from exposure to alcohol in-utero can be better identified, then scientists can more effectively research treatments

Seahorses build a strong pair bond—but if the couple is forcibly separated, they are more than willing to move on.

Seahorses Aren't as Committed as Previously Thought

Pair bonds between the fish aren't as strong as you think

A female dolphin cald swims about her mother at the Madrid Zoo and Aquarium in 2018.

Female Dolphins Have a Fully Functional Clitoris

A new study finds surprising similarities between human and cetacean sexual anatomy

The embryo of a small-spotted catshark, safe inside its egg case, is being raised at the aquarium Oceanogràfic València by Associació Lamna, a nonprofit that promotes shark conservation and research. At this stage, the young shark's gills are still external and it is growing from the sustenance provided in the yolk, visible at the bottom of the egg case.

Biologists Rescue Unborn Baby Sharks at Fish Markets

Scientists are collecting egg cases from recently caught pregnant sharks, raising the babies and releasing them into the wild

Ultrasound of a 4-month-old fetus

A Brief History of the Sonogram

In the mid-1950s, a Scottish obstetrician became the first to apply ultrasound technology to a pregnant human abdomen

The most recent additions to the scimitar-horned oryx herd at the Smithsonian Conservation Biology Institute are two calves borne from an improved artificial insemination method.

Two New Scimitar-Horned Oryx Calves Born Through Improved Methods of Artificial Insemination

The assisted reproduction method will help with population management efforts of these critically endangered species and their rewilding

Mice pups were borne out of freeze-dried mice sperm that had been stored on the International Space Station for up to six years. Some of those mice and their offspring are pictured here.

After a Six-Year Sojourn in Space, Freeze-Dried Mice Sperm Produce Healthy Pups

Scientists say the finding supports the idea that genetic material can be shipped to other worlds to help establish a diversity of life

A male superb lyrebird

This Bird Mimics an Entire Flock to Woo Females

When mating, male lyrebirds reproduce a cacophony of calls usually reserved for when predator is nearby

An Ananteris balzani scorpion couple interlocked in their elaborate mating dance. The male (left) has lost the end of his tail, rendering him unable to defecate.

For Constipated Scorpions, Females Suffer Reproductively. Males, Not So Much.

After the arachnids drop their tails, poop backs up until it kills them, but before that it can affect pregnancy

The protein RAC1 can cause some sperm to spin in circles until they die

Mice Sperm Sabotage Other Swimmers With Poison

A study in mice found that poison-spewing sperm make others swim in circles, but carry the antidote for themselves

This fossil is the oldest known preserved dinosaur cloacal vent.

3-D Reconstruction of Fossil Reveals Secret Sex Life of Dinosaurs

The newly discovered orifice is the oldest known fossilized cloacal vent in existence

The female giant panda Mei Xiang (pronounced may-SHONG) and male Tian Tian (tee-YEN tee-YEN), will return to China at the end of 2023 at the relatively elder panda ages of 25 and 26, respectively.

Smithsonian's Giant Pandas Will Continue to Cavort for Three More Years

A new agreement ensures that the Zoo’s beloved animals and the new cub can stay through 2023

Echidnas have a four-headed penis, though only two heads are put to use at a time.

Nine of the Weirdest Penises in the Animal Kingdom

A short list of some of nature’s most curious phalluses, from the echidna’s four-headed unit to the dolphin’s prehensile member

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