A new study suggests humans belong in an elite “league of monogamy,” ranking closer to beavers and meerkats than to chimpanzees. By comparing full and half siblings across species and human cultures, ...

“While the human penis functions primarily to transfer sperm, our result suggests its unusual large size evolved as a sexual ornament to attract females rather than purely as a badge of status to ...

22 behind-the-scenes details about zookeepers’ work that most of us didn't know or wouldn’t even believe, as shared online.

Beluga whales avoid inbreeding by switching partners over time, helping a small, isolated population stay genetically healthy ...

Tiger sharks are typically solitary wanderers, and it wasn’t clear to scientists how they came together to reproduce. But as HPR’s Catherine Cluett Pactol reports, groundbreaking research from the ...

For instance, it has been argued that as the modern human Y chromosome replaced the Neanderthal equivalent, Neanderthal males became sterile. Other research suggests that human genes might have messed ...

Researchers in Alaska have discovered that beluga whales have lots of different partners and this “mate switching” could be vital for helping populations survive.