Why do spiders curl up when they die?
Why do spiders curl up when they die?
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andthensome

Original Poster:

3,296 posts

208 months

Sunday 14th June 2009
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You know into a little ball?

Is it something to do with tension in their legs or something?

Sheets Tabuer

20,869 posts

237 months

Sunday 14th June 2009
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Because they have an exoskeleton and as such their movement is powered by hydraulic principles, when they die the fluid is no longer pumped to their limbs and extending them.

okgo

41,328 posts

220 months

Sunday 14th June 2009
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Sheets Tabuer said:
Because they have an exoskeleton and as such their movement is powered by hydraulic principles, when they die the fluid is no longer pumped to their limbs and extending them.
Good enough for me!

OllieWinchester

5,694 posts

214 months

Sunday 14th June 2009
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No idea to your question, but in a similar vein, what the hell do woodlice do when they have curled themselves into a ball? I watched one curl up the other day on a paving slab, when he uncurled he was on his back and seemed to have no way to right himself.

JamieBeeston

9,294 posts

287 months

Sunday 14th June 2009
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OllieWinchester said:
No idea to your question, but in a similar vein, what the hell do woodlice do when they have curled themselves into a ball? I watched one curl up the other day on a paving slab, when he uncurled he was on his back and seemed to have no way to right himself.
Hah, had forgotten those things even existed..

I'd imagine cleaning / maintenance / sleeping?

BlackVanGirl

9,932 posts

233 months

Sunday 14th June 2009
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OllieWinchester said:
No idea to your question, but in a similar vein, what the hell do woodlice do when they have curled themselves into a ball? I watched one curl up the other day on a paving slab, when he uncurled he was on his back and seemed to have no way to right himself.
[phreply]
Giving itself a 'treat'.
[/phreply]

The Riddler

6,565 posts

219 months

Sunday 14th June 2009
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OllieWinchester said:
No idea to your question, but in a similar vein, what the hell do woodlice do when they have curled themselves into a ball? I watched one curl up the other day on a paving slab, when he uncurled he was on his back and seemed to have no way to right himself.
Animal instinct to been scared. Humans tend to do it too. Ever noticed when people are full of fear they try to make themselves smaller, where as when you are being aggresive you try make yourself appear bigger.

MacGee

2,513 posts

252 months

Sunday 14th June 2009
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when humans curl up...we hide the vital organs

Famous Graham

26,553 posts

247 months

Sunday 14th June 2009
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So do woodlice. That carapace of theirs is pretty tough in insect terms.

Same principle as hedgehogs.

Pobolycwm

327 posts

202 months

Sunday 14th June 2009
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Do all hedgehogs still curl up when threatened ? I can remember finding one a few years ago and it belted around the park like a whippet trying to escape, I wondered if hedgehogs were developing escape skills via natural selection as curling up into a ball ( say in the middle of a road ) isn`t the best action to surviving

Are there fewer squashed hedgehogs on the road nowadays ? possibly due to them becoming fleeter of foot / paw

Has anyone else tried to catch a fleeing hedgehog ?

The Riddler

6,565 posts

219 months

Sunday 14th June 2009
quotequote all
Pobolycwm said:
Do all hedgehogs still curl up when threatened ? I can remember finding one a few years ago and it belted around the park like a whippet trying to escape, I wondered if hedgehogs were developing escape skills via natural selection as curling up into a ball ( say in the middle of a road ) isn`t the best action to surviving

Are there fewer squashed hedgehogs on the road nowadays ? possibly due to them becoming fleeter of foot / paw

Has anyone else tried to catch a fleeing hedgehog ?
Write to Mr Brown at 10 Downing street and ask for a gov grant to investigate this.

Then blow it on coke and hookers.

Pigeon

18,535 posts

268 months

Sunday 14th June 2009
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I believe it has been investigated and indeed hedgehogs are developing more of a tendency to run away rather than curl up.

As for why spiders curl up when they die it's obvious, it's so the other spiders don't have the hassle of making a coffin with bits for the eight legs sticking out.

Pobolycwm

327 posts

202 months

Sunday 14th June 2009
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Pigeon said:
I believe it has been investigated and indeed hedgehogs are developing more of a tendency to run away rather than curl up.

As for why spiders curl up when they die it's obvious, it's so the other spiders don't have the hassle of making a coffin with bits for the eight legs sticking out.
I guess that`s where I got the thought from and there I was thinking I was on to something original
Can`t find anything about research into hedgehogs legging it and I`ve looked before,do you have any details/pointers ? I`d like to know if this behaviour change has resulted in any changes to the bodies / skeletons of today`s hedgehogs vs their ancestors

OllieWinchester

5,694 posts

214 months

Sunday 14th June 2009
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BlackVanGirl said:
OllieWinchester said:
No idea to your question, but in a similar vein, what the hell do woodlice do when they have curled themselves into a ball? I watched one curl up the other day on a paving slab, when he uncurled he was on his back and seemed to have no way to right himself.
[phreply]
Giving itself a 'treat'.
[/phreply]
The question is, when they have finished being scared, how do they right themselves when they are on a flat surface? The one I observed the other day uncurled on a paving slab and was on his back, and seemed to have no way to get back on his feet. I tried giving him a helping hand to roll over, but he just curled up into a ball again the bloody idiot.

Simpo Two

90,858 posts

287 months

Sunday 14th June 2009
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OllieWinchester said:
The question is, when they have finished being scared, how do they right themselves when they are on a flat surface? The one I observed the other day uncurled on a paving slab and was on his back, and seemed to have no way to get back on his feet. I tried giving him a helping hand to roll over, but he just curled up into a ball again the bloody idiot.
Maybe it's a 50:50 thing - if it doesn't work the first time, he rolls up and has another go. Or perhaps it's Nature's way of controlling the woodlouse population? Anyway, woodlice have been around for gazillions of years so whatever they do, it seems to work.

_Deano

7,413 posts

275 months

Sunday 14th June 2009
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Pobolycwm said:
Do all hedgehogs still curl up when threatened ? I can remember finding one a few years ago and it belted around the park like a whippet trying to escape, I wondered if hedgehogs were developing escape skills via natural selection as curling up into a ball ( say in the middle of a road ) isn`t the best action to surviving

Are there fewer squashed hedgehogs on the road nowadays ? possibly due to them becoming fleeter of foot / paw

Has anyone else tried to catch a fleeing hedgehog ?
Was the hedgehog blue by any chance? Maybe chasing some golden rings?

OllieWinchester

5,694 posts

214 months

Sunday 14th June 2009
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They have been around for ages, but paving slabs and smooth concrete haven't. I expect its a lot easier to right yourself on a rough surface where there is presumably a bit more purchase...

johnnywgk

2,579 posts

204 months

Sunday 14th June 2009
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Deano no no no ferkin sonic, made me larf

TotalControl

8,274 posts

220 months

Sunday 14th June 2009
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1st post after OP explains clearly why spiders do this.

I haven't seen many hedgehogs as of late but have seen a fair few squirrels pasted over the road. I think eventual inbreeding/ toxicated nuts has taken its toll on their brains.