Observe a monarch butterfly coming out of its chrysalis

Encyclopædia Britannica, Inc.

Even something as simple as breathing can get complicated.

Encyclopædia Britannica, Inc.

Overview of water moving through the hydrologic cycle, or water cycle: it evaporates from Earth's surface as water vapor, which condenses in the atmosphere, forming clouds and precipitation, which falls to the land and flows through lakes, rivers, and oceans, from which water evaporates as the cycle repeats.

Encyclopædia Britannica, Inc.

The land iguana (Conolophus), a species endemic to the Galapagos Islands.

Contunico © ZDF Studios GmbH, Mainz

Bionics researchers studying silkworm moths and butterflies.

Contunico © ZDF Studios GmbH, Mainz; Thumbnail © Rinus Baak/Dreamstime.com

Learn about the monarch butterfly, including its annual migration to Mexico.

© MinuteEarth (A Britannica Publishing Partner)

Learn how looking closer at the characteristics of white admiral and red-spotted purple butterflies, which were once classified as separate species, resulted in their consolidation into Limenitis arthemis.

Encyclopædia Britannica, Inc.

Learn about the life cycle of the monarch butterfly (Danaus plexippus).