It was a quiet year for swallowtails this year, so it’s good to see one of next year’s crop. Adult Western Tiger Swallowtails are typically flying from June into early July. The caterpillars munch on the leaves of cottonwood, aspen, willows, wild cherry, and ash. They are found throughout the western half of the US, preferring woodlands near streams and rivers, garden areas, parks, and roadsides. This caterpillar will soon form a chrysalis for the winter. Photo by Glenn Marangelo on 8/31/19 near Clinton, MT.