A pair of zebra finches in a cage
| 10+ min read
Many species of birds and other vertebrates form pair bonds and mate with just one other individual for much of their lives. But the unions don’t always work out. Scientists want to know the underlying factors.

sexual selection

A headshot of Matthew Gage

Evolutionary Ecologist Matthew Gage Dies at 55

Image of the Day: Plumage Patterns

chimpanzee testes

Why Chimpanzees Have Big Testes, and Mandrills Have Small Ones

Larger Hermit Crab Penises May Prevent Shell Theft

Image of the Day: Beetle Fight

Image of the Day: Size Matters

Image of the Day: Glowing Chameleon

The Genetic Strategies of Dealing with High Altitude

Female Fish Select Mates’ Sperm

Scientists Solve Giant Sperm Paradox

Lizard Swaps Mode of Deciding Its Sex

From the Feature Well

Connecting the Dots

Carnal Knowledge

Contributors

The Hidden Side of Sex

Doodoo Rendezvous

Faces for Fighting?

For Some Male Crickets, Silence Means Survival

Standing Up for Sex

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How Bacteria Outsmart Disinfectants

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February 2025, Issue 1

A Nanoparticle Delivery System for Gene Therapy

A reimagined lipid vehicle for nucleic acids could overcome the limitations of current vectors.

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Considerations for Cell-Based Assays in Immuno-Oncology Research

Considerations for Cell-Based Assays in Immuno-Oncology Research

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From Water Bears to Grizzly Bears: Unusual Animal Models

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Sex Differences in Neurological Research

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Tecan introduces Veya: bringing digital, scalable automation to labs worldwide

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