This phenomenon occurs when two sperm fertilise a single egg, resulting in a mixture of male and female cells in the ...

A Russian scientist who works at Harvard University’s Medical School has spent the last six weeks in immigration detention and is facing possible deportation after undeclared frog embryo samples ...

Complex neural circuits likely arose independently in birds and mammals, suggesting that vertebrates evolved intelligence ...

Answer: Birds do not have the sex organs common to mammals. Instead, both male and female birds have what’s known as a cloaca ...

Chickens treated to inhibit the sonic hedgehog (Shh) pathway during development grow feathers that resemble ancient ...

A dangerous bird flu, in other words, was suddenly circulating in mammals—mammals with which people have ongoing, extensive ...

The Harvard Center for International Development (CID) is a research center working across the University and a global network of researchers and practitioners to build an international pool of talent ...

Meta-analysis reveals there is no evidence that variation in clutch size in birds is driven by the reproduction–survival trade-off.

For fertility patients who never dreamed they’d have extra embryos, decisions about what to do with the surplus are personal — and increasingly political Susie Sheehan sat alone on her couch ...

A Port St. Lucie resident, who is also a wildlife rehab specialist, is sounding the alarm about a development that could harm threatened bird species. News Today's news ...

Today, birds and crocodiles just lay eggs ... But this research found that some of the strange looks of these sharks happen in the late stage of the embryonic development. The position of the jaws may ...

There's nothing quite as delightful as getting a visit from a little backyard bird. From bluebirds to woodpeckers to hummingbirds, these avian beauties add music and movement to yards and gardens all ...