Every fall, millions (around 50 million) of monarch butterflies descend upon only 12 hilltops in places not too far from Mexico City. It's still a mystery to scientists how these butterflies find their way every year to the same places and occupy the same 73 mile radius. I have seen these butterflies in Texas enroute to Mexico, and I am excited that their winter sanctuary is something I might be able to see in my lifetime. Their winter stay is almost up, and the butterflies begin their journey back north in a few weeks, starting in March. This breaktaking video on Youtube nearly made me cry. Canta y no llores!
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