- I didn't realize what I was looking at. It was like a wall, turning from green to gray. It was monarch wings, folded as they roosted - the underside of their wings are grayish. So, here was this wall of butterflies, and I just couldn't believe it. For the first time in my life, I saw millions of monarch butterflies right in front of me. They were covering the trees, they were all over the boughs. They were on the trunks. They were on the limbs. They were on the bushes. They were everywhere. It is one of the most marvelous sights you can behold in the biological world. [describing his first visit to the monarch butterflies' winter home in Mexico]
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