Jet Eliot

Anise Swallowtail Butterfly on fennel, Calif.

Of the 18,500 butterfly species worldwide, every species relies on a host plant to provide food for its larvae. Fennel is one of the host larval plants for the anise swallowtail butterfly, a common butterfly found along the western coast of North America.

Here in northern California we have a lot of wild fennel–found along freeways, in parks and yards, city parking lots and pavement cracks. This is great news for the anise swallowtail butterfly who depends on fennel to begin life. It’s great news for us, too; our summers are consistently decorated with this large butterfly.

Anise Swallowtail caterpillar, final instar, California

The host larval plant provides the food vitally necessary for the young caterpillar stages, or instars, of the butterfly. When they form wings and fly off, they seek primarily nectar thereafter, because they no longer have mouthparts for chewing.

Observing…

View original post 342 more words