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In order for vertebrate embryos to develop their body axes, they require what is known as an embryonic signaling center. This group of cells provides the instructions that determine where up and down, ...

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Evolution doesn't always create brighter colors or larger bodies—sometimes it favors darkness. Through a genetic trait known as melanism, certain animals develop unusually dark coloration that can ...

Earth’s earliest animals may have held evolution back because they reproduced asexually, creating low-competition communities that changed very little over time. When environmental pressures pushed ...

Fossils unearthed in Ethiopia are reshaping our view of human evolution. Instead of a straight march from ape-like ancestors to modern humans, researchers now see a tangled, branching tree with ...

A pigeon pecking at crumbs in a city square rarely attracts much attention. It is easy to see it as an ordinary bird, part of the background of daily life. Yet its ancestry reaches back into a world ...