Saturday, July 30th, 2005 - 11:32 PM

Why Spiders Curl Up When They Die

My oldest child asked me why spiders curl up when they die, so we looked it up.

We found a web page with a lot of information about spiders, but it seemed a little too technical and wordy for casual curiosity… so here’s my simplified explanation:

Two of the six joints in a spider’s leg are hydraulic. The spider flexes muscles that increase pressure and straighten those joints. When the spider dies, those muscles relax and the legs curl up.

Here’s the photo (from a previous post) that inspired the question:

Dead Spider

3 Comments to “Why Spiders Curl Up When They Die”

  1. Jerry Says:

    Great work on finding your answer. Maybe this article would explain it a little better and not be so ‘wordy.’
    http://pestcemetery.com/why-do-spiders-die-with-their-legs-curled-up/

  2. John Says:

    Front page on Reddit!! Thanks!!

    http://www.reddit.com/r/todayilearned/comments/18o40x/til_the_reason_why_spiders_legs_curl_up_is/

  3. Michael Says:

    Nice job :>

Leave a Reply