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World’s First Female “Penis” Found, in Cave-Dwelling Bugs

Four new species of cave insects in Brazil have sex-reversed genitalia, a “completely astonishing” discovery, scientists say.

Your Weird Animal Questions Answered: Love in the Animal Kingdom

With spring in the air, we answer your questions about animal romance, from elephant seals to stick insects.

Rare Video Footage Shows the Dynamics of Cougar Courtship

How cougars find each other in a vast landscape of mountains, raging water, thick forests, and rocky bluffs is one of life’s great mysteries for those of us who study mountain lions. I’ve spent many long hours contemplating this subject, and here’s what I’ve decided: it might be easier than we think. I’m speculating here,…

Weird Purple Frog Seduces Females From Underground

Males calls to females from beneath a thin layer of soil—the only frog known to have such an odd behavior, a new study says.

Lemurs in Love Take on the Same Smell

It’s a finding fit for Valentine’s Day: Coquerel’s sifakas that have mated and produced offspring alter their natural scents to smell alike, a new study says.

Dangerous Dating: 4 Animals That Take Love to the Extreme

Flatworms that fence with their penises and male fish that literally latch onto their mates are among nature’s most odd and risky mating rituals.

Hummingbirds May Change Their Tunes to Seduce Mates

Male hummingbirds in Costa Rice can change their tunes to attract mates, new research shows.

Spiky Baby Killers: Echidna Secrets Revealed

An egg-laying, spiny mammal with a four-headed penis is already pretty bizarre, but it turns out short-beaked echidnas are even stranger than we thought.

Mosquito Sperm Follow Their “Noses” to an Egg

Proteins on mosquito sperm enable them to sniff their way to waiting eggs in female mosquitoes.

9 Things You Didn’t Know About Groundhogs

In honor of Groundhog Day, here are nine facts about groundhogs you probably didn’t know.

Striking Picture: Bats Hunt Frogs by Detecting Water Ripples

Male rain forest frogs sing love songs that create water ripples—and attract bat predators, a new study says.

Male Black Widow Spiders “Twerk” to Avoid Being Eaten by Females

Male black widow spiders shake their booties to send friendly messages to females—and avoid getting eaten, a new study says.

Bone Worm Mating Revealed: Males Have “Penis” on Head

Male bone worms use a “penis” on their heads to inseminate females, a new study says.

Rare Horned Lizards of Sri Lanka Revealed

The little-studied reptiles may use their strange horns to communicate with mates or rivals, new research suggests.

Praying Mantises Falling Victim to Sex Cannibal

New Zealand’s male mantises have developed a fatal attraction for a cannibal invader whose females devour its mates after sex, scientists report.