Please report all monarchs you see:

• Adults
• Eggs & Larvae
• Overnight Roosts
• Peak Migration Events

Scientists have many questions about where, how, and why monarchs form roosts during fall migration. Find out what is known about overnight roosts and explore the many mysteries that remain.

Driving Question: What can we learn about fall migration by studying overnight roosts?

For use with Photo Gallery: Why Overnight Roosts?

Scientists have many questions about where, how, and why monarchs form roosts during fall migration. What can we learn about fall migration by studying overnight roosts?