Western Tiger Swallowtail

Note the missing "tail" which probably assisted this individual in an escape from a predatory bird

a common swallowtail butterfly of western North America, frequently seen in urban parks and gardens, as well as in rural woodlands and riparian areas. It is a member of the Papilio genus, of which Papilio appalachiensis and Papilio xuthus are also members. It is a large, brightly colored and active butterfly, rarely seen at rest; its wingspan is 7 to 10 cm (3 to 4 in), and its wings are yellow with black stripes, and it has blue and orange spots near its tail. It has the "tails" on the hind wings that are often found in swallowtails.