A Dream Come True on Butterfly Wings
Jul 03, 2018
2 minutes
By JOHANNA SILVER
Look up,” says Tim Wong, pointing to a concrete wall of the pump house in an out-of-the-way corner of the San Francisco Botanical Garden. What looks like leaf litter lodged on the textured wall, he says, is the chrysalis of a California pipevine swallowtail butterfly (Battus philenor hirsuta). The brown speck is something only trained eyes
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