black

swallowtail

caterpillar

papilio

polyxenes

defense

mechanism

orange

organ

osmeterium

chemical

repellent

long

island

york

usa

horn

eastern

insect

butterfly

green

instar

yellow

butterflies

north

america

american

lepidoptera

caterpillars

united

states

lepidopteran

larva

spots

metamorphosis

pupae

transformation

leaf

white

vertical

stripes

growth

larvae

cylindrical

bodies

antenna

habitat

dill