Big evolutionary changes, like the emergence of flight, vision, or live offspring, don't occur in sudden leaps but evolve gradually, say biologists led by the University of Sheffield. In a study ...

"By discovering and studying the recent evolutionary shift in the way marine snails give birth, we're now able to understand these major changes and apply our methods to many other evolutionary shifts ...

is a snail-loving hoarder made relentlessly shy by repeated hardships, beginning with the death of her mother while giving birth to Grace and her twin brother Gilbert (Kodi Smit-McPhee ...