"The monarchs are truly arriving now," exclaimed Estela Romero on Tuesday from her hometown of Angangueo. Tens of millions of monarchs are flying toward the region now, on time for their traditional arrival. What makes this region so special for monarch butterflies?

This Week's Update Includes:

• News: Monarchs Arriving in Large Numbers Now
• Slideshow: Why is this place so special for monarchs?
• The Migration: Maps and Journal Page

News: Monarchs Arriving in Large Numbers Now

"Throughout town we can see butterflies flying overhead today. My camera could not catch them, they were flying so high!" wrote Estela Romero on Tuesday.

As the monarchs arrive each November, the Mexican people are celebrating the Day of the Dead (Dia de los Muertos) to honor the lives of their ancestors. This week, Estela takes us to the alter (ofrenda) of a family friend, to a town celebration, and to the community cemetery where lost loved ones are remembered.

• The Monarchs Are Here!
• Las monarcas estan aqui!

Imagine millions of monarchs flying across the finish line as they complete their long migration. Congratulations, monarchs!

Now that the monarchs have reached their winter home, we're about to wrap up our migration-tracking season. We'll be back next week with our final update of the season. Meanwhile, if you're still seeing monarchs, please report your observations. We'll continue to collect sightings until the monarchs have vacated the north!