The origin of turtles has always been a bit of a puzzle for scientists who study the evolution of animals. To this day, where ...

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

A forgotten fossil discovered in a museum drawer after more than 60 years is challenging assumptions about animal evolution.

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

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 ...

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 ...

Critical proteins involved in animal stem cell regulation are much older than previously thought, predating the origin of animals that likely evolved more than 700 million years ago. This is the ...

The question of why females mate with multiple males has long puzzled evolutionary biologists. A new study of African ...

Think you can spot the difference? Discover 14 famous pairs of look-alike animals that are completely separate biological ...

Today, biologists taking a closer look at the animals located inside the Chernobyl Exclusion Zone (CEZ), which is about the size of Yosemite National Park, and investigating how decades of radiation ...