Black Swallowtail

A dozen Black Swallowtails are newcomers to our Community Supported Agriculture farm.  They are butterflies of open fields and gardens.  Males are territorial, often chasing rivals away from flowers.  This species is found in across the eastern United States and into northern Mexico.  Some internet sources claim they are found in South America and even Australia--there seems to be some confusion here.  Australia is so distant from North America; one wonders how an unaided butterfly might make that leap.  In any case, they are partial to dill, carrots, parsley and fennel.