Each fall the 5th generation of Monarchs from the eastern United States and Canada migrate up to 3500 miles to an area near Mexico City in the mountains at about 10,000 feet and settle down for the winter months. Their congregation amounts to about 300 million butterflies. These Monarchs settle in the same trees as their great, great grandparents did the year before.
Werkbladen vermenigvuldigen, tafels, optellen, aftrekken en delen. Ook cijferen en negatieve getallen.