Photograph of three male zebra finches (Taeniopygia castanotis), whose mating calls were used as part of the study. Credit: Raina Fan. The bright colors of butterfly wings, the sweet aromas of flowers ...

The bright colors of butterfly wings, the sweet aromas of flowers, and the euphonious melodies of songbirds all evolved as ...

Researchers found a rare, strictly binary brain feature in mice that is permanently active in females but completely dormant ...

The female reproductive system is made up of the parts that are inside and outside the body that help a female make a baby. Both the female and male reproductive system are needed for this. The female ...

Examples of the computer-generated, male figures used in our study. Men assess potential rivals that have a larger penis as more of a threat, both physically and sexually, according to a study by ...

This spider is female on one side and male on the other due to a phenomenon called gynandromorphism. Credit: Surin Limrudee. By all accounts, it began as an ordinary day in Kanchanaburi, a forested ...

Not only is this species new to science, but this remarkable individual is the first record of a rare biological phenomenon (bilateral gynandromorphism) in this previously unknown species. One of the ...

To expand and promote research and data collection on reproductive health conditions, which are the leading causes of infertility, and provide training opportunities for medical professionals to learn ...

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The Texas Senate passed House Bill 229, which strictly defines "woman" and "man" based on reproductive organs, in a 20-11 party-line vote. The bill requires state documents and data to use these ...