why are the bugs allways die on their back, with their legs up ?
921446
Bugs move their legs by increasing and decreasing the pressure of their internal liquids. When bugs die, the pressure decreases, and the legs curl up. Bugs are top heavy, so they flip over.
703524
They like bugs and worms.
698699
Somewhere I read that their spray mechanism involves an eversible gland. If the gland is already out when you pick up their tail, it's too late for you. But if it hasn't, then they can't evert it with their body weight on their tail. There's no way to see it so it's mighty risky.
798155
yes, but they don't have noses or any exterior breathing tube to bring air inside the body. Instead, insects breath through their skin. This means that as the insect increases in size, they have less surface area in which they bring air into their body. This is one of the ways that the size of insects is limited to being fairly small, as their body design doesn't scale up very well.
539788
Mosquitoes tend not to fly very high, as it makes them susceptible to the elements.  They usually prefer guerrilla tactics, hiding in vegetation, flying out when a blood meal is close.  \n\nAnother thing is that mosquitoes rarely swarm.  When you see a swarm of "mosquito-like" insects flying up in the air, 9 out of 10 times they are MIDGES, a small insect that somewhat resembles the mosquito.
1105042
Bugs are a separate division in the insect class.....
1182498
I think it's cause when they die of poisoning they kick around alot and they just flip over, \n\nand otherwise, how could you tell if they were dead or not?
857222
Hmmm...wow...a VERY general question.  This is out of my field, but your other questions were so engaging I decided to see what else you have asked...\n\nFor the first one (how do they thrive/what modifications do they have). I am going to list things insects all have in common and that kill them when things go wrong with these systems:\nQ1:\n1) A chitinous exoskeleton, usually with a waxy covering that conserves water and provides mechanical protection.\n2) A system of spicules that enables oxygen/CO2 exchange without having to resort to an overly flexible out membrane keeping that mechanical protection sound. \n3) Segmented bodies and legs to allow greater flexibility of movement than is achievable solely with a segmented exoskeleton\n4) Wings for flight or additional mechanical protection\n5) Rudimentary circulatory system (this one might not qualify since I bet their ancestors had something like this too.)\n\nQ2:\nThere are a LOT of kinds of neoptera and I don't know much evolutionary biology so I will not attempt that one. Probably one trend has to do with the falling partial pressure of oxygen over the past few hundred million years and the guys getting smaller to cope. They all have flexible wings.  I dunno what else.  Sorry.\n\nQ3:  Compare flies to butterflies/moths/skippers.\nCommonalities: all 4 wings have flight function; larval stage that pupates; adults have tubular mouth parts\nDifferences:  antenna, scaled wings. \nThat is a start anyway. \n\nQ4:  Similarities: Chitinous exoskeletons, segmented bodies (but different numbers of segments), jointed legs, \nDifferences: wings vs. more legs, compound vs. simple eyes, pupation/metamorphosis vs. nymphal stages\n\nQ5:  Ecto means outside, and everyone know what parasitic means, so this would include lice, fleas, maybe mosquitos (they only suck blood for egg laying, you know), certain kinds of flies and true bugs.  They mostly live on blood, but I think some eat dead skin.  Geez, what else CAN you eat living on the outside of a critter?\n\nWhew.  Tough.
689293
actually, insects have 6 legs, arachnids (spiders) have 8.\n\n6 legs is actually a very efficient and simple mode of moving.  When an insect walks the front and rear legs on one side along with the middle leg on the other move in lock step while the other 3 form a stable platform for the insect.
907809
It is molting... they will grow back.\n\nHowever, it could just be reaching the end of its lifespan... they usually die at the end of fall...\n\nHere's a link for you\nhttp://ohioline.osu.edu/hyg-fact/2000/2060.html
577698
It has nothing whatsoever to do with blood loss. Obviously, since spider that are poironed and suffer no blood loss exhibit the same pose.\n\nThe answer itself is simple, but you need a bit of background information first.\n\nMost animals have leg muscles that come in pairs. One muscle causes the leg to bend, the other muscle causes the leg to straighten. That’s the system used by humans for example, with the muscles at the front of the thigh straightening the leg, and the muscles at the back of the thigh bending the leg. A similar system of paired muscles is also used by insects.\n\nSpiders are different. The only muscles they have in their legs cause the legs to bend. In order to straighten out their legs spiders have to pump water from their body out into the legs to straighten them hydraulically.\n\n\nThat’s half the story. The other half of the story is that after animals die their muscles contract. That might seem odd, but muscles are designed backwards, so they require energy to stay relaxed. When an animal dies the muscles run out of energy and the muscles contract and stay contracted. In most animals when the muscles contract after death they all contact. The muscle that causes the leg to straighten contracts, and the muscle that causes the leg to bend contracts.  The two muscles work against each other and the animal becomes literally as stiff as a board, locked into the position in which it dies by the contracted muscles : rigor mortis. \n\nYou often hear them referring to “rigor” on shows like CSI when they are trying to establish a time of death. That is what they mean, that the body has gone stiff because all the muscles have contracted.\n\nOK, so now we have the two important facts: \n\n1)Spiders don’t have paired muscles in their legs.\n2)Animal muscles contract after the animal dies.\n\n\nFrom their you can probably work out the answer by yourself. Spiders don’t; have paired leg muscles. The only leg muscles they have cause the legs to contract and fold up under the body. There is no other half of the muscle pair to oppose that contraction.\n\nAs a result when a spider enters rigor the legs move. They fold in as tightly as possible because that is the direction that the single muscles pull. And as a result spiders are always found with their legs pulled up under the body. It’s the position that they have to adopt in rigor because they lack paired muscles in their legs.\n\nAs for why spiders are about the only animals in the world that don’t have paired muscles on their limbs, that is another story altogether.
824037
fireants probably killed them....or you have an anteater on the loose....although i dont know why either one would leave the heads
575699
Insects do not have an internal skeletal system, they have exoskeletons.  So all insects are invertibrates.
734919
insect crawls and bug can fly
366509
This was a question that intrigued me as well. Whenever I sprayed a roach, it would always flip over and die on its back. Very strange. \nThe Straight Dope has some theories on this position. See http://www.straightdope.com/classics/a1_024.html .
111166
When they fly into a ceiling, their feet stick on the ceiling same as with a wall. Flies, like all insects have 6 legs, 2 in the "front" and 4 in the "rear" --\napproximately. As the fly approaches the ceiling, it "reaches up overhead"\nand grips the ceiling with its two front legs. It's forward momentum carries the rest of the fly in the direction of flight. It then does a "180 degree"\nflip planting its 4 rear legs on the ceiling, landing in the opposite direction as the initial direction of flight.\n\nThis is not as bizarre as it sounds. Human gymnasts on the uneven bars perform similar trajectories in some of their exercises.
662361
Maybe you should move somewhere where you don't have roaches.\n\nGravity. Their backs are heavier.