As a PhD student in the 1920s, she moved a lump of cells from embryos of one newt species into another. The transplanted ...

By tracking neural crest cells in catshark embryos, researchers discovered that the molecular toolkit behind face-building is ...

Phylogenomic analysis harnesses genome-scale data sets to reconstruct the deep branches of the animal tree of life, resolving longstanding debates about the relationships among major lineages such as ...

Long before vertebrates walked on land, millipedes had the place to themselves. Hundreds of millions of years before ...

A monkey descending a tree trunk often keeps its head up, moving almost like a cautious climber backing down a ladder. Squirrels and many other mammals, by contrast, tend to go headfirst. That ...

Frontmatter -- CONTENTS -- PREFACE AND NOTES -- ACKNOWLEDGMENTS -- 1. Before Animals -- 2. Phylogenetics and the Base of the Animal Tree of Life -- 3. Ctenophora -- 4 ...

The origin of turtles has always been a bit of a puzzle for scientists who study the evolution of animals. To this day, where they fit in the tree of life remains a highly debated topic. The ...

A huge and beautifully preserved suite of fossils discovered in China has cast doubt on the idea that complex life flourished dramatically during a rapid burst of evolution known as the Cambrian ...

An international team of experts has resolved long-standing questions about the evolutionary history of mollusks, one of the most diverse zoological groups on the planet. The study, published in ...

Australian tree frogs today make up over one third of all known frog species on the continent. Among this group, iconic species such as the green tree frog (Litoria caerulea) and the green and golden ...