START A PETITION 27,000,000 members: the world's largest community for good

Butterflies May Use Medicinal Plants

Butterflies May Use Medicinal Plants

Emory University biologists have found Monarch butterflies may use milkweed plants to reduce infections in their offspring. Female monarch adults infected with a parasite, choose to lay their eggs on the leaves of milkweed plants. The leaves act as both food and medicine for the offspring, as they are toxic to parasites in the larvae. Non-infected female monarchs had no preference for the types of  milkweed leaves they laid their eggs on.

Researcher Jaap de Roode said, “We believe that our experiments provide the best evidence to date that animals use medication.” (Source: Their findings were published October 6, in the journal Ecology Letters.

They also found the mother’s behavior benefits only the offspring, and not the mother, which means the behavior is trans-generational. How the behavior, which resembles human foresight, came to be is a mystery.

The fact such behavior exists, suggests a kind of intelligence in nature that is not always conceded or understood.

Ecologist Mark Hunter who assisted with the research said, “When I walk around outside, I think of the plants I see as a great, green pharmacy. But what also strikes me is how little we actually know about what that pharmacy has to offer. Studying organisms engaged in self-medication gives us a clue as to what compounds might be worth investigating for their potential as human medicines.” (Source:

Dozens of milkweed species make up the caterpillar’s diet. Some of the milkweed plants contain a chemical that is harmless to caterpillars, but is toxic to their predators. Jaap de Roode wanted to investigate whether the choice of milkweed plants for egg laying was not only about acquiring the toxin to ward off predators. It appears he made an important discovery, not only for science, but potentially for human medicine. Mr. Hunter said such use of plants might indicate they have medicinal value for humans as well as insects. He has been awarded a grant to examine the chemical components of milkweed plants for potential therapeutic agents.

Monarchs are famous for their colors and annual migratory movements to Mexico from the United States. Soon they might also be known for their use of natural medicine.

Image Credit: Tulip32

Related Links
Monarch Butterflies Under Siege
Ants Use Antibiotics to Kill Weeds
New Snail Species Are a Good Sign

Read more: Behavior & Communication, Pets, Wildlife,

have you shared this story yet?

go ahead, give it a little love


+ add your own
9:48AM PDT on Sep 6, 2011

Isn't that interesting!

3:18PM PDT on Nov 2, 2010

Roberto Vivas, Yes. Using green and biological agents to control crop infestations is a worthwhile adjustment.

3:43AM PDT on Oct 18, 2010

Amazing! Thank you Jake!!!

5:53PM PDT on Oct 17, 2010

Amazing what the butterflies can do! Now if we could stop spraying pesticides on plants..

9:11AM PDT on Oct 17, 2010

Cool! :) thanks!

3:21AM PDT on Oct 17, 2010

I thought as much. Dogs and cats eat grass for digestion. My dogs eat lots of Hibiscus leaves every day that I have to grow more shoe flower bushes in my garden. Very interesting article, thanks.

8:43PM PDT on Oct 16, 2010

That would be interesting to know animals use plants for medicine. We have a lot to learn from animals.

12:27PM PDT on Oct 16, 2010

Very interesting. Thanks Jake.

10:56AM PDT on Oct 16, 2010


3:25PM PDT on Oct 15, 2010

Wow! There's always something new and wonderful to discover about the intricacy in the interactions of plants and animals and nature overall. Just another lesson why we cannot afford to lose species through human actions.

add your comment

Disclaimer: The views expressed above are solely those of the author and may not reflect those of
Care2, Inc., its employees or advertisers.

people are talking


Select names from your address book   |   Help

We hate spam. We do not sell or share the email addresses you provide.