The Butterfly Conservatory: Tropical Butterflies Alive in Winter, an annual favorite visited by millions of children and adults, returns to the American Museum of Natural History on October 16. Celebrating its thirteenth year at the Museum, this highly popular winter attraction transforms the iciest day into a summer escape, inviting visitors to mingle with up to 500 fluttering, iridescent butterflies among blooming tropical flowers and lush green vegetation in 80-degree temperatures.