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Producers: Hazel Stark & Joe Horn Host: Hazel Stark Swallowtail butterflies are a group of large and colorful butterflies that exist all over most of the planet. As we start to head to beaches in late spring, so do they. Sandy beaches, gravel, mud, and puddles are ideal places to look for groups of these butterflies now, engaging in a behavior called “puddling.” Photos, a full transcript, references, contact information, and more available at thenatureofphenology.wordpress.com