Posted by: BibleScienceGuy | February 22, 2010

15. Mexican Jumping Beans (with video)

Were you ever intrigued as a child (or even as an adult) by Mexican jumping beans? What makes the little brown beans wriggle around and look alive?

The answer involves the Jumping Bean Moth.

The secret is that live moth larvae (caterpillars) live inside the jumping beans and cause them to “wiggle” when the caterpillars move inside. Warmth increases the movements.

In the spring, moths emerge from last year’s beans and lay eggs in the flowers of the poisonous tree Sebastiana pavoniana. Upon hatching the larva bores into a seed pod (bean) and eats out a cavity. It attaches itself to the inside walls with silk threads. It can live for months inside the pod.

Heat causes the little caterpillar to try to roll to a cooler place. Its struggles pull on the silk threads causing the seed pod to twitch.

Here’s an 18-second video showing typical movements of Mexican jumping beans.

The larva pupates inside the bean and metamorphoses into a moth. The small silvery gray-brown moth exits the bean and lives only a few days to mate and lay more eggs.

The northwestern Mexican state of Sonora, immediately south of Arizona, styles itself as the “Jumping Bean Capital of the World”. Mexicans call the beans brincadors (hoppers).

Read the prequels in this series on Monarch Butterflies and their significance for the creation/evolution controversy:
1. Insect GPS
2. Monarch Butterflies
3. Caterpillar or Butterfly—Which Was First?
4. Monarch Caterpillars
5. Morphing Monarchs
6. Changing Chrysalis
7. Emerging Monarchs
8. Butterfly vs. Caterpillar
9. Migrating Monarchs
10. Navigating Monarchs
11. Monarchs on Noah’s Ark?
12. Monarch or Viceroy?
13. Butterfly Evolution?
14. Butterfly or Moth?

Read the sequel:
16. Silk

Soli Deo Gloria.

Bible-Science Guy logo

Subscribe – Don’t miss future blog posts!
Click the sidebar’s “SUBSCRIBE” button to follow the
Bible-Science Guy Blog. You’ll automatically receive
new posts free by email. Click

©William T. Pelletier, Ph.D.
“contending earnestly for the faith”
“destroying speculations against the knowledge of God”
(Jude 1:3; 2 Cor 10:4)
Monday February 22, 2010 A.D.

Read my February 2010 Bible-Science column
Manhood and Monogamy.

And Yahweh made the beasts of the earth after their kind, and the cattle after their kind, and everything that creeps on the ground after its kind; and Yahweh saw that it was good. (Genesis 1:25)


  1. Fun! Jumping beans are hysterical…remember them as a child? found them recently online at



  2. I absolutely love your blog and find most of your post’s to be just what I’m looking for. Would you offer guest writers to write content for you personally? I wouldn’t mind producing a post or elaborating on some of the subjects you write related to here. Again, awesome blog!


    • Currently I don’t use guest writers for posts. People (guest writers) can respond to posts or elaborate on them in the comments. Thank you for the encouraging words.


  3. Wow that was strange. I just wrote an incredibly long comment but after I clicked submit my comment didn’t show up. Grrrr… well I’m not writing all that over again. Anyhow, just wanted to say fantastic blog!


  4. Do you mind if I quote a few of your articles as long as I provide credit and sources back to your weblog? My blog is in the very same niche as yours and my users would truly benefit from a lot of the information you provide here. Please let me know if this alright with you. Thank you!


    • Quoting my blog with credit and a link to the quoted blog is fine.


  5. Greetings from California! I’m bored at work so I decided to check out your site on my iphone during lunch break. I love the information you provide here and can’t wait to take a look when I get home. I’m shocked at how fast your blog loaded on my cell phone .. I’m not even using WIFI, just 3G .. Anyways, very good site!


  6. Thanks for the article, how can I make is so that I receive an email sent to me every time there is a new update?


    • You can sign up for email posts in the right-hand sidebar under “Follow Bible-Science Guy.”


  7. Hola! I’ve been following your blog for some time now and finally got the bravery to go ahead and give you a shout out from Austin Texas! Just wanted to tell you keep up the good work!


What do you think? Leave a comment. Please pray for the worldwide impact of the Bible-Science Guy ministry!

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.


%d bloggers like this: