Salticidae (family); Portia spp. cited for cognition

Jumping spider

Worldwide except the polar regions, with over 6,000 described species — the largest family of spiders. Portia, the genus behind most of the planning research, occurs across Africa, Asia and Australasia.

Group: Salticidae
IUCN: NE
Reviewed: 2026-08-25

Read this first

Popular claims checked

The claim: Spiders cannot hear — they sense only vibrations through the surfaces they stand on.

What the evidence says: Jumping spiders detect airborne sound over three metres away, using fine hairs on the legs rather than an eardrum, and neurons in the brain respond to low-frequency tones with a freeze response. This overturned a long-standing textbook claim: the spider has no ear, so it was assumed it could not hear at a distance, and nobody had recorded from the brain to check.

Why it persists: The absence of an obvious organ was taken as the absence of the sense, and recording from a spider brain was thought impossible because of the hydraulic pressure inside it.

Where you'll meet it: Textbook accounts of arachnid senses · General nature writing

Sources (2)

Peer reviewedShamble, Paul S., Menda, Gil, Golden, James R., Miles, Ronald N., Hoy, Ronald R. (2016)
Airborne acoustic perception by a jumping spiderCurrent Biology, vol. 26pp. 2913-2920Open source
Peer reviewedMenda, Gil, Shamble, Paul S., Nitzany, Eyal I., Golden, James R., Hoy, Ronald R. (2014)
Visual perception in the brain of a jumping spiderCurrent Biology, vol. 24pp. 2580-2585Open source

The claim: Ballooning spiders fly on electricity, using electrostatic force to travel long distances.

What the evidence says: The experiment showed that atmospheric electric fields trigger ballooning and can assist takeoff in still air — which is remarkable enough. It did not show that electrostatic force accounts for long-distance flight; the actual travelling is still done by the air. The finding is about the decision to launch, not the journey.

Why it persists: 'Spiders fly on electricity' is a much better headline than 'electric fields influence when spiders decide to take off'.

Where you'll meet it: Popular coverage of the 2018 electric-field study · Science-news aggregators

Sources (1)

Peer reviewedMorley, Erica L., Robert, Daniel (2018)
Electric fields elicit ballooning in spidersCurrent Biology, vol. 28pp. 2324-2330.e2Open source

Verified observation

In nature

A hunting spider that sees better than any animal its size and plans routes before taking them. Portia scans a scene from a vantage point, then follows a detour that takes it out of sight of its prey; when no innate signal works on a victim's web, it invents one by trial and error and remembers which worked.

visual acuityEstablished

Salticid principal eyes resolve about 0.04 degrees — finer than any other animal of comparable size, and comparable to much larger vertebrates — achieved with a boosted-focal-length retina scanned by muscles.

Sources (1)

Academic bookHarland, Duane P., Li, Daiqin, Jackson, Robert R. (2012)
How jumping spiders see the worldHow Animals See the World, Oxford University Presspp. 133-163Open source

depth perceptionEstablished

Jumping spiders judge distance from image defocus, comparing sharpness across stacked retinal layers under green light — a depth mechanism otherwise unknown in animals.

Sources (1)

Peer reviewedNagata, Takashi, Koyanagi, Mitsumasa, Tsukamoto, Hisao, Terakita, Akihisa (2012)
Depth perception from image defocus in a jumping spiderScience, vol. 335pp. 469-471Open source

route planningEstablished

Portia scans a scene from a vantage point and then follows an indirect route to its prey that takes it out of visual contact with the target for much of the journey.

Sources (1)

Peer reviewedTarsitano, Michael S., Andrew, Richard (1999)
Scanning and route selection in the jumping spider Portia labiataAnimal Behaviour, vol. 58pp. 255-265Open source

aggressive mimicryEstablished

Portia plucks a victim spider's web with varied vibratory signals and, when no innate signal works, generates novel ones by trial and error, keeping the one that draws the resident out.

Sources (1)

Peer reviewedClark, Robert J., Jackson, Robert R. (2000)
Web use during predatory encounters between Portia fimbriata, an araneophagic jumping spider, and its preferred prey, other jumping spidersNew Zealand Journal of Zoology, vol. 27pp. 129-136Open source

prey discriminationEstablished

Portia fimbriata distinguishes other jumping spiders from all other prey by vision alone, on cues as specific as the arrangement of a rival's principal eyes.

Sources (1)

Peer reviewedHarland, Duane P., Jackson, Robert R. (2000)
Cues by which Portia fimbriata, an araneophagic jumping spider, distinguishes jumping-spider prey from other preyJournal of Experimental Biology, vol. 203pp. 3485-3494Open source

airborne hearingSupported

Despite having no eardrum, jumping spiders detect airborne sound over three metres away using leg hairs, and neurons in the brain respond to low-frequency tones with a freeze response.

Sources (1)

Peer reviewedShamble, Paul S., Menda, Gil, Golden, James R., Miles, Ronald N., Hoy, Ronald R. (2016)
Airborne acoustic perception by a jumping spiderCurrent Biology, vol. 26pp. 2913-2920Open source

neural recordingSupported

Direct recording from the salticid brain found neurons responsive to visual motion — the first such recordings from any spider, long thought impossible because of hydraulic pressure in the cephalothorax.

Sources (1)

Peer reviewedMenda, Gil, Shamble, Paul S., Nitzany, Eyal I., Golden, James R., Hoy, Ronald R. (2014)
Visual perception in the brain of a jumping spiderCurrent Biology, vol. 24pp. 2580-2585Open source

electrostatic dispersalSupported

Spiders begin ballooning in response to atmospheric electric fields alone, with no wind — they detect the field through fine leg hairs and take off in still air.

Sources (1)

Peer reviewedMorley, Erica L., Robert, Daniel (2018)
Electric fields elicit ballooning in spidersCurrent Biology, vol. 28pp. 2324-2330.e2Open source

web plasticitySupported

Orb-weavers adjust silk composition and web geometry to their nutritional state and recent prey, so a web records the spider's condition rather than expressing a fixed template.

Sources (1)

Peer reviewedBlamires, Sean J., Sahni, Vasav, Dhinojwala, Ali, Blackledge, Todd A., Tso, I-Min (2014)
Nutrient deprivation induces property variations in spider gluey silkPLoS ONE, vol. 9p. e88487Open source

extended cognitionDisputed

Whether the web functions as an extension of spider cognition — with the animal offloading computation into silk tension and adjusting the web to change what it can perceive — is actively contested.

Sources (2)

Peer reviewedJapyassú, Hilton F., Laland, Kevin N. (2017)
Extended spider cognitionAnimal Cognition, vol. 20pp. 375-395Open source
Academic bookEberhard, William G. (2020)
Spider Webs: Behavior, Function, and EvolutionChapter 7: Cues directing web construction behavior, University of Chicago Presspp. 313-394Open source

Evidence to reflection

What the behavior can suggest

This section is interpretation, not evidence. It reads documented behavior as a human character trait — a comparison we are drawing, not something the animal intends.

calculating

Mixed

Portia surveys a scene from a vantage point, then takes a detour that puts its prey out of sight for much of the route, and arrives anyway.

This is the fact that makes the spider hard to dismiss: it commits to a route it cannot verify while travelling, because it worked the route out before starting. Read as character, that is someone who plans in advance precisely because they know they will lose sight of the goal — and who is therefore unnerving to work with, since the detour looks like going the wrong way.

You worked it out before you set off, which is why you can afford to walk away from the thing you are aiming at.

patient

Positive

When no inherited signal draws a victim spider out of its web, Portia improvises new vibrations by trial and error and keeps the one that works.

The animal runs out of instinct and keeps going — testing signals until the web answers. Read as character, that is patience as experimentation: someone who does not abandon a problem when the standard approach fails but starts generating options and remembers which one landed. There is nothing gentle about this; the payoff is another spider's death.

When the usual approach fails you start inventing, and you remember exactly which improvisation worked.

precise

Positive

Salticid eyes resolve about 0.04 degrees and judge distance by comparing how blurred an image is across stacked retinal layers.

The mechanism is unusual: distance is read from blur rather than from two eyes comparing angles. Read as character, that is someone who gets their bearings from the quality of what they can see rather than from a second opinion — precision arrived at alone, by attending to how clear things are.

You work out how far away something is by how clearly you can see it, and you have never needed anyone to confirm it.

restless

Mixed

Spiders take off on a silk thread in response to atmospheric electric fields alone, in completely still air.

Departure is triggered by a field the animal cannot see and most animals cannot detect, in conditions where nothing appears to be happening. Read as character, that is someone who leaves on a signal nobody else registers — which looks arbitrary from outside and is not. Marked mixed because the destination is entirely unchosen: ballooning goes where the air goes.

You left on a signal nobody else felt, and you had no idea where you would land.

Named tradition

Traditional symbolism

These accounts are attributed to specific peoples and sources. They are not merged into a generic Native tradition.

Akan (Akan)

Documented from the early 20th century; a living tradition with a major diaspora presence. Living tradition.

Name in language: Ananse

Ananse the spider obtains all the world's stories from the sky god Nyame by capturing four creatures nobody believed could be caught. The genre term for folktale is anansesɛm — 'spider matters' — so the spider is not merely a character in the stories but the owner and organising principle of narrative itself. Ananse wins by disproportion: small, physically negligible, prevailing through calculation — and is often punished for overreach, so the tales instruct by negative example as much as by triumph.

Context: The tradition travelled with enslaved Akan people and continues as Anancy in Jamaica and Aunt Nancy in the Gullah Sea Islands.

Sources (1)

EthnographyRattray, Robert Sutherland (1930)
Akan-Ashanti Folk-TalesClarendon Press

Hopi (Hopituh Shi-nu-mu)

Documented from the late 19th century; ceremonial life continuing. Living tradition.

Name in language: Kokyangwuti (Spider Grandmother); Gogyeng Sowuhti

Spider Grandmother is a creator and guide who, with Tawa, forms the first people and leads them upward through the successive worlds to emerge into this one. She characteristically appears small and easily overlooked, riding unnoticed behind a hero's ear and giving counsel — in the Hopi telling, power arrives as an old woman or a spider rather than as force. She is associated with weaving, with the passage upward, and with instruction.

Context: The emergence narrative in broad outline is publicly told; ceremonial specifics tied to particular societies are not.

Sources (1)

EthnographyCourlander, Harold (1971)
The Fourth World of the Hopis: The Epic Story of the Hopi Indians as Preserved in Their Legends and TraditionsUniversity of New Mexico Press

Modern Western material

Modern readings

Modern Western material, published in the 20th or 21st century. Listed to show what the popular genre claims — not as evidence about any people.

Core shamanism (Michael Harner, Foundation for Shamanic Studies)

First published 1980

Contemporary practice

Core shamanism reads the spider as a power animal of weaving and of fate, retrieved on the journey and associated with seeing how the threads of a situation connect.

Our assessment: The weaving association is real in both traditions here, but what it carries is quite different. Ananse owns narrative itself and wins by calculation, and is punished for overreaching; Spider Grandmother is a creator whose power appears deliberately small and unnoticed. Neither is a faculty a person retrieves — one is the ground of storytelling, the other a being who leads people between worlds.

Sources (3)

Modern deckHarner, Michael (1980)
The Way of the Shaman: A Guide to Power and HealingHarper & Rowpp. 57-72
Academic bookWallis, Robert J. (2003)
Shamans/Neo-Shamans: Ecstasy, Alternative Archaeologies and Contemporary PagansRoutledgepp. 29-49
Academic bookZnamenski, Andrei A. (2007)
The Beauty of the Primitive: Shamanism and the Western ImaginationOxford University Presspp. 233-264

Open research questions

Replace Rattray with a contemporary Akan-authored treatment — Kwesi Yankah on Akan oratory is the obvious starting point.
The extended-cognition dispute is live and the critical commentary sits in the same journal issue; cite that commentary directly rather than relying on Eberhard for the opposing view.