In order to track patterns of fall migration and spring dispersal, thousands of monarchs will be tagged. Small tags weighing between 1/50th and 1/100th of the butterfly’s body weight are attached to the underside of its hindwing. This tag adheres without needing to rub off scales.

A unique identification code and a 1-877 toll-free telephone number are included on the tag so that project members, the general public, and citizen scientists can contact Monarch Alert with details about their sightings of tagged monarchs.

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- last updated: 1 November 2007