What is a parasitoid?
Parasitoids are specialized insects that spend most of their life history attached to or inside a host that is ultimately consumed or killed, such as small flies and wasps that lay eggs on or inside other insects. Parasitoid larvae then eat their prey from the inside out, usually emerging from the consumed prey carcass as a pupa or adult. Monarch parasitoids include Tachinid flies and Braconidae wasps.
You can contribute to scientists' understanding of monarch parasitoids by submitting your observations to the Monarch Larva Monitoring Project! Find out more about how you can get involved here.