Zombie caterpillars

Nature has some bizarre corners. A couple of years ago, I saw these caterpillars, part of a large group steadily demolishing a small shrub.

P1200567

Then this year I saw this group, all together on a branch a few feet off the ground, each one bent into a U-shape, not eating, and not moving, though they were alive (I poked them gently).

DSC06023

I thought they were the same kind and were about to pupate, but I was wrong, on both counts. I hadn’t noticed the tiny white hairs on some of them, and the next day, they looked like this:

DSC06134

In close up, you can clearly see the “hairs” are growing out of their bodies:

DSC06134-2

This is a fungus which penetrates their bodies, and then absorbs nutrients from their insides, leaving a shell. This next photo is of a different group of caterpillars on the same tree. You can see that the segments  of caterpillar between each pair of legs are getting hollowed out as the fungus does its work:

DSC06377

A thunderstorm destroyed the whole ghoulish tangle, so I will never know what the final stage would have looked like.

By the way, I have failed to identify the fungus or the caterpillar, but the fungus is probably a type of Cordyceps. If anyone knows, let me know.

PS: I did wonder if it was not a fungus but some sort of communal cocoon, but my friendly mushroom expert confirmed the fungal guess. And if it was a cocoon,  it would need to survive a thunderstorm.

3 thoughts on “Zombie caterpillars”

Leave a Reply

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

WordPress.com Logo

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

Google+ photo

You are commenting using your Google+ 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