Beauty on the Wing: Life Story of the Monarch Butterfly is available to stream on pbs.org and the free PBS App, available on iPhone, Apple TV, Android TV, Android smartphones, Amazon Fire TV ...

Scientists usually study butterfly lifespans by marking them, and then either recapturing or observing them later. Researchers can also estimate a butterfly’s age by the condition of its wings. All ...

What Is a Weed? Not everyone agrees on which plants are weeds, or what to do about them. Not all weeds need to be eradicated.

Scientists also declared several other extinctions, including the first documented plant extinction in New Hampshire.