Why do spiders legs curl up when they die?
Question by blueblue: Why do spiders legs curl up when they die?
Ew there was a big black furry spider in the bathroom and I sprayed it with flyspray but the next day it was only half dead. It had moved to other side of the room though and its legs were half curled and slightly moving… so i sprayed it again and nows its legs are all curled up cos its dead now.
Best answer:
Answer by Music23
they dont have any force to stretch it up.. i guess..
Answer by bigknuxred
I have always wondered this myself i think i will stick around for the anwser its true spiders ALWAYS CURL UP WHEN THE DIE! i think it has somthing to do with their muscle contractions because they are dead. nice question
Answer by h4x0r
They’re basically hydraulic. Their natural state is curled up, and if I recall correctly pressure is exerted on a fluid to make them extend. When they die, the pressure is no longer exerted and they curl up.
Muscles attached on the inside of the exoskeleton contract to move the legs inward, but spiders don’t have any muscles to extend the legs back out again. Instead, they have to force bodily fluids (mainly blood) into the legs to push them outward. If a spider loses too much body water, it can’t generate the necessary hydraulic pressure to push its legs out. This is why you sometimes see spiders on their backs with their legs curled up.
Answer by Buzzard
The same thing happens in most creatures, it’s called rigor mortis. I think what causes it is the body drying out after the heart stops pumping blood. When something looses moisture, it’s shrinking, getting smaller, and that will cause muscles to contract.
Here’s the link to the wiki on Rigor Mortis: http://en.wikipedia.org/wiki/Rigor_mortis
That guy talking about their hydraulic nature is on the money, I guess- loss of fluids leading to stiffness/ drying out…
Answer by cynthia c
because they’re dead.!
Answer by me!! lol s
it wwas probably trying to protect its egg sac so it curled its legs up on top of its back
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