In this Jan. 23, 2019 photo, numerous butterflies can be seen at one of their annual wintering spots in Cerro Pelón Monarch Butterfly Sanctuary near Macheros, Mexico. (Denise Siraco via AP)
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In this Jan. 23, 2019 photo, numerous butterflies can be seen at one of their annual wintering spots in Cerro Pelón Monarch Butterfly Sanctuary near Macheros, Mexico. (Denise Siraco via AP)
