Rigor Vitae: Life Unyielding

Friday, April 28, 2006

MAN TO MANTIS

The first Praying Mantis (Mantis religiosa) of the year perches on my weathered redwood fence. Barely a quarter of an inch long, his normally cryptic straw coloring stands out on the dark wood. A few days ago he and a couple hundred siblings squirmed free of their egg case, or ootheca. Very few of them will survive the summer. Chances are good that a sibling served as this little fellow's first meal, and most of those who don't fall to cannibalism will nourish some other creature in the coming months. Over the summer, the survivors will grow to a length upwards of three inches. The adult males, who fly well, are likely to wander further than their larger sisters before mating. The females of many spiders, scorpions, midges, and other arthropods enjoy their mates as post-nuptial dinners, but this behavior is most famous among the mantids. Allusions to the deadly mantis mate abound in legend and literature worldwide. One of the many colorful historical rulers of Madagascar is remembered as “The Mantis Queen.” Her henchmen were required to bring her handsome young men, then to toss them over a cliff once she was through with them.

It's common for a male Praying Mantis to lose his head when mating, and counterintuitively enough, it seems that there's a benefit in this. Not only does his sacrifice help to nourish the growing embryos of his offspring, but once his cerebral fear center is gone, his focus on the task at hand is more complete; headless mantises produce more sperm. Once fertilized, the female will carry her eggs for a month or more before laying them within a foamy, meringue-like secretion that hardens quickly into the ootheca. All the adults will die by first frost, but the oothecae will overwinter to begin the cycle anew in the spring.
Most summers I find myself taking an adult Praying Mantis captive. I never tire of watching them; their erect posture and mobile head with two large eyes give them an uncommon look of intelligence, and their rapacious nature is really fun to watch. They often tackle amazing quarry. A biologist friend told me of a mantis at a friend's ranch in Colombia that captured bats as they emerged from their daytime roosts in pockets of a woven palm ceiling. Unable to spread their wings, they could do nothing but accommodate the insect, who ate until sated, then moved on, leaving a tiny, faceless corpse to drop onto the dining table.

M. religiosa was introduced to North America accidentally at the end of the 19th century, and spread through most of the continent within a hundred years. As a boy, I tried twice to introduce them into our yard, but to no avail—both efforts were immediately frustrated by paper wasps (Polistes sp.), which consistently found and ate them within minutes. The first mantis I ever saw, though, was a native ground mantid (Litaneutria sp.) that I caught beneath a Curlyleaf Mountain Mahogany (Cercocarpus ledifolius) when I was about seven. An inch or so in length, it resembled nothing more than a gray mahogany twig. Never again have I seen one of these insects, though I've spent untold hours in such habitat—their amazingly cryptic appearance all but rules out their discovery. Children are much better than adults at finding insects, anyway. Having a head that's built more than twice as close to the ground helps a lot.
_____________________
upper: MALAYSIAN PEACOCK MANTIS (2005) acrylio 11" X 6"
lower: COSTA RICAN SCRUB MANTIS ( 1998) acrylic 51/2" x 4"

8 Comments:

Anonymous Neil said...

Bat-eating mantids!? Now that is a plastic predator.

I've been keeping a close eye on about a half dozen oothecae scattered around our yard, hoping I can get some good photos of the hatch. I'd give my own head for some nice shots of siblicide!

4:15 PM  
Anonymous Cindy said...

I've got 9 mantis eggs resting peacefully in my crisper until we get leaf-out. Then I'll tie them to dowels in my window boxes, where they will literally explode in a huge mass when they emerge, then I move them as quickly as I can out into my gardens where they have more cover and are less vulerable. (I made the mistake of rearing them out indoors just once. They were so tiny they easily crawled out of the mesh enclosure.. and gathering up dozens 1/8 inch long baby youngsters was a bit challenging)
I've watched them prey on their siblings- they're just as adept as a grown mantis and are ferocious little hunters, but so amazing to watch.
(I've got a link to a mantis feeding on a hummingbird somewhere.. not a pretty sight, but it happens).

7:52 PM  
Blogger cpbvk said...

Neil and Cindy: Sounds like we should look forward to some great upcoming mantis photography on your respective blogs. Cindy, that's amazing to hear about the hummingbird. Don't mess with that mantis!

6:36 AM  
Anonymous Cindy said...

here's the link, although it's not the one I viewed before. Eeeks, now that makes two of them ;)

http://www.birdwatchersdigest.com/site/backyardbirds/hummingbirds/mantis-hummer.aspx

I tried to view Neils' blog, but got an error message.. hope to see his photos too, I plan on taking them, but when they emerge, it happens SO fast that usually the 'explosion' is missed. But with 9 oothecae, I may get lucky this time around :)

11:00 AM  
Anonymous Neil said...

cindy I think I mistyped the address!
this should work

microecos.wordpress.com

1:41 PM  
Blogger slskenyon said...

I always thought the mantis was one of the most interesting looking insects--it looks so complicated how it is built/put together and it moves in such an angular, almost robot-like way.

5:32 PM  
Blogger cpbvk said...

Cindy: Thanks for that url. That must have been quite a fight!
Slskenyon: I remember seeing a giant rear-projected mantis in a horror movie as a kid. It was one of my first real cinematic thrills.

6:15 PM  
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