Monarch Butterflies’ Mexican Holiday
A flash of orange wings drifts past your window in Maine. Three months later, that same butterfly might cling to an oyamel fir tree in Mexico, having flown over 4,000 kilometers. Scientists scratched their heads for years about this one. Such tiny creatures couldn’t possibly fly so far, they thought. The monarchs proved everyone wrong. Four generations of butterflies complete the whole round trip each year. The great-great-grandchildren somehow find their way back to the exact same trees their ancestors visited.