Fear-eliciting images of modern and ancestral threats are equally likely to evoke physiological reactions, despite their ...

Ancestral threats like snakes and heights trigger more intense physiological fear responses (sweating) than modern threats like firearms and disease.

The origins of snakes have baffled scientists for decades. How did these limbless, slithering predators evolve from their distant lizard ancestors? A remarkable discovery on the Isle of Skye, Scotland ...

Introduction: Seeing and knowing -- Ancient snakes, modern snakes: "what is a snake?" -- Ancient snake lizards: the fossil record -- The anatomy of ancient snake lizards -- Ancient snake lizard ...

Snakes have lost the gene that encodes ghrelin, a hormone that helps regulate hunger in many vertebrates, according to a new ...