School of Life Sciences | Ask A Biologist

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Why is Rudolp's nose red?

Milkweed Bug

Milkweed Bug

Large milkweed bug: Oncopeltus fasciatus

  • Habitat: live in fields and meadows that contain plants such as the milkweed
  • Size: 9-18mm
  • Predators/Prey: Milkweed bugs use their mouths to pierce plants (mostly milkweed) and drink the juices.
  • Population: life span 1 month
  • Interesting facts: Because they eat the milkweed plant they contain toxins that can make their predators sick if eaten. Their bright orange coloration also warns predators away.

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Milkweed Bug

This is the original scanning electron microscope (SEM) image before it was colorized.

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Milkweed Bug

This is the original scanning electron microscope (SEM) image before it was colorized.

Share to Google Classroom

Be part of Ask A Biologist

by volunteering, or simply sending us feedback on the site. Scientists, teachers, writers, illustrators, and translators are all important to the program. If you are interested in helping with the website we have a Volunteer page to get the process started.