Artist at Exit 0 Riverblog

  Red-faced and bizarrely hairy, the unique caterpillar of the Tussock moth was munching its way through a maple leaf.  Everything about its appearance says I’m not tasty and leave me alone.  It’s now October and it won’t be much longer before the first frost and freezes arrive and with it the colder temperatures which will quiet insect life at the Falls of the Ohio until next year.  The caterpillar inspired me to post a few other entomological images taken in the park.  I confess that I have always liked insects as examples of how diverse life can be.  I’m amazed at the incredible variety and forms that our six-legged friends can assume. Here’s another really weird caterpillar that I found at the Falls that I just haven’t been able to identify through any of my field guides.  Does anybody out there in blog land recognize this?

This fluorescent green caterpillar has dramatic eye spots on its posterior that would incite a predator to strike there first.  Its anterior is located on the opposite end and I would have fallen for this trick too, but noticed that it was walking backwards.  I wondered once it completed its metamorphosis…would the adult be a moth or butterfly?  Maybe some day I will stumble upon and collect a large cocoon I don’t recognize and I’ll take it home and watch a miracle as it emerges from its silken home.

During this time of year, certain willow trees at the Falls are exuding sap which draws a variety of insect life including various flies, hornets, and butterflies to these sweet “licks”.  Whether the flowing sap is due to disease or injury is unknown to me? The large bullet-like hornets are so preoccupied with sipping the sap that they ignore me.  To test this, I’ve carefully touched them with my finger while they were feeding and they remained docile.  I was walking through the tall grass when I noticed a large flying insect land on the bush next to me.  Despite its wonderful camouflage I was able to locate our next insect after a short search.

This is the Chinese Mantid which I read was introduced into this country in 1896.  It is the largest praying mantis you are likely to come across in the United States and this specimen was about four inches or ten centimeters long.  I’ve seen them grow larger, but not in this park.  In fact, this is only the second mantid I’ve seen out here.  There are several native species, but they are smaller and more obscure.   And now, it’s time to reveal my most spectacular discovery which is a near but harmless relative of the praying mantis.  Here is a picture of its head.

And now, for the rest of its body which is about two feet long or roughly sixty centimeters.  I came upon this unique life form casually walking across the driftwood on its way to somewhere else.

Although as insects go this is a giant…it is also an extremely fragile creature.  It is a member of the walking stick family.  It relies on slow movements and its cryptic forms to merge with its surroundings.  The Falls Phasmid is strictly a vegetarian and eats the foliage from a variety of different trees.

I came across this specimen in broad daylight.  I had always heard that they were nocturnal and chose to restrict their movements during the day to avoid detection.  Walking stick insects are among the largest insects we have.  This species is additionally strange in that its head, thorax, and abdomen are so clearly differentiated.  Some scientists have gone so far as to suggest a bit of mimicry at work here.  On the surface it does seem to possess a superficial resemblance to a giant ant which might be enough to dissuade predators from attacking it.

I did observe this particular Phasmid making return trips to a particular willow tree where it clung to a nest-like structure that was hanging down from a branch.  The meaning of this structure was not immediately apparent.  Perhaps the Falls Phasmid uses this form to help it overwinter?  Keeping a respectful distance away, I did see the stick insect walking slowly over the riverbank, but I couldn’t tell if it was searching for something in particular and I did not witness it feeding.

Originally, the Falls Phasmid may have had the ability to fly.  Other walking stick insects from around the world have vestigial wings that suggest a different past.  Our specimen lacks even the most superficial suggestion of wings which hints at an ancient lineage.  Perhaps all stick insects evolved here first and spread around the world much later?

I watched the Falls Phasmid for a while and took a bunch of photographs of it before leaving the park.  I’m curious about that tree that it likes to hang out on and so will check it the next time I’m here.  On my way out of the park, I also came around this wonderful Viceroy butterfly and thought that this would make a fitting image to end this post.  When I think of the butterflies that inhabit the park…this is the species that comes to mind first for me.