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On (anise?) plants on the side of the trail.
Nice spotting! These caterpillars are likely Papilio zelicaon or Papilio polyxenes, rather than Papilio glaucus. P. glaucus are not found in California and their caterpillars are much different looking.Here are some references.Anise Swallowtail: http://bugguide.net/node/view/28235Black Swallowtail: http://bugguide.net/node/view/2636Tiger Swallowtail: http://bugguide.net/node/view/491And on a side note, please keep your images with minimal photo editing. We prefer to see them without the distractions of fancy borders or other alterations. If you have not done so already, please take a read through the FAQ page for the posting guidelines (and other general info on the features of the site): http://www.projectnoah.org/faq
Spotted on Mar 17, 2015 Submitted on Mar 17, 2015