Call to Action
Identifying Monarchs
Identifying Larvae
Report A Sighting
Monitoring Monarchs
Tagging Monarchs
Request Tags
Report A Tag
Monarch Hotspots
Raising Monarchs
Plant Nurseries
Upcoming Events
Support Us

Identifying Larvae

Monarch caterpillars and queen caterpillars are close relatives and look very similar. They both only use milkweeds as their host plant. In addition, the caterpillar of the black swallowtail butterfly looks a lot like a monarch. Here are some ways you can identify each one.
Note: A caterpillar is called a larva. Caterpillars are called larvae.

Danaus plexippus

Monarch: Two pair of filaments, one on each end.

Yellow, black and white stripes.

Danaus gilippus

Queen: Three pair of filaments one on each end and one in the middle.

Filaments are reddish and black stripe surrounds yellow dot.

Black Swallowtail
Papilio polyxenes

Black swallowtail: Larva is often mistaken as a monarch. If you see a caterpillar in dill, rue, fennel or parsley, you likely have a black swallowtail larva.

Black swallowtail: Photo by Laura Miller

Unless specified otherwise, all data Copyright © 2010-2018 Southwest Monarch Study Inc. Information from this site may not be copied or distributed without prior written approval from Southwest Monarch Study

Webdesign Copyright © 2010-2018 Southwest Monarch Study Inc.