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

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 ...

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 opening pages of the 1943 book The Little Prince recall how the narrator, as a child, once drew a picture not of a hat — as every adult insisted it was — but of a boa constrictor that had ...