The other morning, it was just cool enough to put on a jacket for the first time this “year.” Yes, that sounds strange to me, too. I suppose every profession has a different start to their “year” — ...

Every so often, unseasonably mild weather will rouse butterflies from hibernation earlier than usual in the Inland Northwest. But in January? That’s plain extraordinary. Yet this is just what’s ...

(CNN) — Challenging times are ahead for smaller, lighter-colored butterflies as Earth’s climate continues to warm, a new study has found. Unlike their relatives with larger wings and darker colors, ...

Even when the weather blows them off course, tagging has shown that many butterflies can get back on track and keep heading south. After migrating, they overwinter in cool, moist places, resting to ...

Editor’s Note: Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Challenging times are ahead for smaller, ...