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What force turns dead cockroaches upside down?

Community and Forum → Other questions. Insects topics → What force turns dead cockroaches upside down?

Dmitrii Musolin, 17.08.2007 17:05

colleagues! smile.gif

here's a question you asked me here:

What force turns dead cockroaches upside down?


-- and somehow I don't know what to say...

Really: it is more logical to say so-ran - died-fell on his belly and that's all... Although it is more stable on the back... I think that no one has asked this question and does not know for sure... I don't think it makes any sense, but it's just a mechanic... Or death throes just... And, by the way, it is not a fact at all that the proportion "on the back": "on the belly" is statistically significantly different from 50: 50...

Bedbugs will die in different ways, I would say, without special preferred poses...

Can someone add something?

Thanks!

Д.

Comments

17.08.2007 17:12, Alex2006

really "voprosets"!
the first thing that comes to mind is postmortem rigor of the paws (straightening) + when drying, the center of gravity shifts to the dorsal side... confused.gif

17.08.2007 17:41, Dinusik

I don't think it's not the paws. They often die on their backs, too. When you poison cockroaches, they mostly turn over on their backs while still alive. It feels like a suffocating person is trying to take a deeper breath... It must make some sense. Although, maybe just first of all, the part of the nervous system responsible for the position of the body in space is paralyzed.

17.08.2007 17:44, Dmitrii Musolin

It feels like a suffocating person is trying to take a deeper breath... It must make some sense. Although, maybe just first of all, the part of the nervous system responsible for the position of the body in space is paralyzed.


Well, that's what I wrote about -- "Or the death throes just..."

17.08.2007 17:46, Alex2006

I don't think it's not the paws. They often die on their backs, too. When you poison cockroaches, they mostly turn over on their backs while still alive. It feels like a suffocating person is trying to take a deeper breath... It must make some sense. Although, maybe just first of all, the part of the nervous system responsible for the position of the body in space is paralyzed.

do cockroaches breathe easier while lying on their backs? confused.gif
about the nervous system in my opinion sounds more reliable... but almost all insects die like that...

17.08.2007 20:00, Nilson

Perhaps it's just that the limbs that turn the cockroach on its back are greatly reduced during convulsions - and this is already a fairly stable condition. Turning over backwards requires coordinated movements.

19.08.2007 7:22, Mylabris

I asked a question to a person far from entomology. And I got, in my opinion, a brilliant answer: A cockroach falling from a wall or ceiling lands on its back. And they crawl on the walls and not on the floor because the top does not stink of dichlorvos ...
In my opinion, the original smile.gifis
Likes: 1

19.08.2007 12:24, Chromocenter

And when they just roll over after running around on the floor? IMHO, the point here is in the contraction of the leg muscles - I noticed that they are very much shortened, which the legs bend into a characteristic pose. What Nilson wrote about.

23.08.2007 15:48, marasmius

We are talking, of course, about Blatella and others like them. Experiment is cheaper than calculation. Spray the cockroach lightly with chloroform. Try to put it back up, not immediately, but it will succeed. But any movement of the paw will tip him over on his back, in a state of stable balance. When a cockroach dies, the legs most often straighten out at some point (cramps, protein denaturation during drying, etc.), this is true, this has already been said, knocking the cockroach over. If at the same time the hind and middle legs bend to the head and diverge to the sides, then the position with the back up and the belly up will be stable. Quite often dead males (!) (they are easier) Prussians meet in this position.
Likes: 2

24.10.2007 17:33, Трофим

Read interesting! rolleyes.gif But really simple questions sometimes lead to a dead end. I was asked when they looked at the pronotum of a hawk moth under a microscope. And how does she keep her fur coat warm? What to answer ... confused.gif about the color I know what is due. And inside the hairs are hollow or not. It is clear that they are filled with either pigment or something else. In short, I don't know what's out there...right now and here I tell about the same nonsense as my friends. So there is such a question?

24.10.2007 20:21, Tigran Oganesov

Read interesting! rolleyes.gif But really simple questions sometimes lead to a dead end. I was asked when they looked at the pronotum of a hawk moth under a microscope. And how does she keep her fur coat warm? What to answer ... confused.gif about the color I know what is due. And inside the hairs are hollow or not. It is clear that they are filled with either pigment or something else. In short, I don't know what's out there...right now and here I tell about the same nonsense as my friends. So there is such a question?

When it sits, it certainly does not warm. Yes, and when flying, I think wink.gif

24.10.2007 21:29, RippeR

And what to mean by whether their cover warms them..?
Most likely, yes, butterflies are nocturnal, not for nothing, probably have a rather thick pubescence (I'm silent about harpies).. Although the daytime cover is also present, it is also usually far from weak.. Does it warm up, do they not steam?? I don't know..

This post was edited by RippeR - 10/24/2007 21: 33

25.10.2007 10:03, vilgeforce

In my opinion, the "fluffiness" of butterflies plays the role of "stealth technology", which does not allow bats to find them effectively in the dark: -)

25.10.2007 12:37, omar

Definitely the role of a heat insulator is played by the hairiness of butterflies. That is why night-hairy more than daytime, and often at night, when they are active, it is cool or cold. Diurnal ones are also often very hairy - usually these are high-altitude species, for example, the genus Parnassius, which are exposed to sharp temperature changes. But at the same time, some late autumn moths are almost not hairy at all, and fly almost in frosts. The same goes for all sorts of small moths and leafhoppers can be active almost in winter, but they are devoid of fur. Can kotbegemot clarify this situation?

26.10.2007 12:37, Трофим

Interestingly it turns out already cool.gif

26.10.2007 15:29, RippeR

I came across a crazy idea, but maybe someone will say something about it?
Suddenly, the ratio of density, mass, etc., etc. is not sufficient for the crystallization of water in the vessels of small leafworms, so they need a small cover to maintain the temperature??

26.10.2007 22:01, Konstantin Shorenko

Back to our cockroaches dear friends! I think it's a nervous system thing. Perhaps the effect of the poison disrupts orientation in space and they react like this. If the cockroach on your back is not quite a dead cockroach, it happens that you turn it over, push it lightly with your finger, and it starts to rattle and jump. And you can't think about rigor of the paws or a long flight from the ceiling. It's all about the nervous system , I can tell you for sure!

28.10.2007 11:58, guest: Leoha

Hello! I have an idea about cockroaches. Maybe they turn over when their legs are tucked in? And that, quite logically. When the cockroach is conscious, it clings to the floor with its paws, and when it is "starved" ,it presses them so that the ends of the paws are crossed. It is impossible to resist in this position-I tried it myself. And he falls on his side, and if his back is heavier, then on his back!

In my opinion, the idea is iterative.
Likes: 1

14.11.2007 20:06, VBoris

Dormidont is right, of course. Only I would like to correct his remark. Not necessarily the effect of the poison disrupts the nervous system. As someone correctly noted, many insects die in this position. Perhaps they instinctively roll over on their backs before they die. And thus "offer" predators to eat themselves. I don't take it from the ceiling. In my terrarium, zoophobas and Reticulated cockroaches live together. One of the cockroaches rolled over and was eaten alive by the zoophobas larvae.
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http://www.faunarb.narod.ru

14.11.2007 20:11, VBoris

In my opinion, the "fluffiness" of butterflies plays the role of "stealth technology", which does not allow bats to find them effectively in the dark :-)

This is, of course, an original theorysmile.gif. I was in one of the BBC programs "Wildlife", if I'm not mistaken, showed how some butterflies pick up a signal sent by a bat and then either fall to the ground, or abruptly change the direction of flight.
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http://www.faunarb.narod.ru

This post was edited by VBoris - 11/14/2007 20: 12

14.11.2007 22:14, RippeR

zoophobas are hto?

14.11.2007 22:26, VBoris

The second name, if I'm not mistaken, is mealworms. They were eaten on the fact of fear and in some other programssmile.gif.

15.11.2007 12:22, RippeR

ahhh smile.gifrhino beetle larvae lol.gif
Just kidding, I got smile.gifit

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