Orb weaver spiders build exquisite spiral webs not only to catch insects, but to extend their senses. Once they shrinkwrap their prey with silk, the nearly blind spiders can store them for later, and read their web's strands as a kind of memory map to guide them back.

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The more than 48,000 spider species create a wide variety of web styles. There are over 4,000 different species of orb weaver spiders alone; these are the eightlegged spinners that create the famous spiralshaped webs.

Anyone who’s watched orb weavers in action has seen them use their exquisite creations to deftly ensnare flying insects. Impressive as this, the webs function as much more than deadly traps.

Webs play an integral role in everything an orb weaver does. When spiders are hungry, they can tighten the web’s strands and even adjust its size and shape, depending on what size of prey they’re in the mood for. These species are only able to see light, dark and a little movement, but they are somehow able to quickly navigate their webs, pinpointing their unlucky victims and binding them in silk, a meal saved for later.

Because they can do so much with such tiny brains, some researchers think orb weavers use their webs as a form of extended cognition, outsourcing advanced mental tasks like problemsolving and memory. For example, once they have killed and wrapped their prey, a spider can store it for later, then easily find it again. They don’t need to remember every single thread they have spun — just a few previous steps. By using their webs to do some of their thinking for them, orb weavers may be preserving precious brain power for other necessary and complex tasks like capturing prey.

Where do orb weavers spiders live?

Orb weaver species live everywhere on planet earth except for Antarctica and the Arctic. As long as there is abundant food (i.e. insects) and a place to build their web, you are likely to find an orb weaver.

What other kinds of spider webs are there besides orb webs?

In addition to the signature spiralshaped designs made by orb weavers, spider webs come in various other styles, such as tangles (aka cobwebs), funnels and sheets.

+ Read the entire article on KQED Science:

https://www.kqed.org/science/1969661/...

+ For more information:

The work of Thomas Hesselberg
http://www.thomashesselberg.com/

Hilton Japyassú’s work on extended cognition in spiders
https://link.springer.com/article/10....

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