Avicularia variegata

Physical description and identification

Avicularia variegata is a tree-dwelling pinktoe of northern South America and a member of the same New World lineage as every other Avicularia. Like all tarantulas it sits in the infraorder Mygalomorphae, whose fangs drive downward in parallel instead of pinching sideways. The build is the giveaway for an arboreal species: long legs, a relatively light body and broad adhesive foot pads made for gripping bark and leaves.

Adults

• Size: a leg span of about 12–15 cm (4.7–5.9 in). Females are the bulkier sex; mature males are lighter with proportionally longer legs.
• Colour: two well-known forms circulate under this name. One is dark with a pink to brick-red sheen produced by reddish-brown setae, particularly over the abdomen — the source of the pet-trade names "brick red pinktoe" and "grizzled pinktoe". The other shows a golden carapace with a greenish cast and pale yellowish rings on the leg segments. Both carry the pale tarsal pads the genus is named for.
• Eyes: eight small eyes grouped on a single raised tubercle. This is a touch-and-vibration hunter, not a visual one.
• Defensive hairs: type II urticating hairs, and their position matters. They sit on the abdomen, not on the legs, and they are not flicked into the air; the spider releases them by pressing or rubbing its abdomen against whatever is bothering it. Accounts describing a pinktoe flicking hairs from its legs confuse this genus with the terrestrial New World tarantulas.
• Separating it from relatives: colour is unreliable across the genus. Firm identification rests on adult genitalia and locality, which is exactly why this species was confused with A. avicularia for so long.

Eggs and egg sac

The female encloses her eggs in a silk sac built inside the retreat and stays with it, moving it about within the tube as humidity and temperature shift. Clutches in this genus are in the order of 50–200 eggs rather than the many hundreds quoted for large terrestrial birdeaters.

Spiderlings

Hatchlings remain in the mother's tube only briefly, using up what is left of the egg yolk before dispersing — not the extended family life sometimes described. Young pinktoes often wear the adult colours in reverse, with a pale body and dark feet, and the pattern inverts across successive moults. Each spiderling spins its own tube within days.

The silk tube

It is true that this spider does not build a web to catch prey, but the common line that it "does not build webs" is misleading. It is a heavy silk producer: each individual constructs a tubular retreat open at both ends, stitched between leaves, into a bromeliad or behind bark, and extends it continually. The tube is shelter, moulting chamber and nursery, and the silk radiating from it carries the footsteps of prey — a completely different use of silk from the aerial snares covered in our guide to spider webs.

Where Avicularia variegata lives

The species occurs in northern South America: Venezuela and the northern states of Brazil — Amazonas, Pará, Roraima and Amapá — in the block of forest north of the lower Amazon. That range overlaps broadly with the common pink toe tarantula, which is part of why the two were confused for so long.

Habitat is mature rainforest and well-grown secondary forest, including forest edge and old plantations where tall vegetation remains. Retreats go into rolled leaves, bromeliad axils, palm crowns, hollow limbs and bark crevices, usually well above the ground. The spider does not burrow and rarely comes down: the animals people find at ground level are almost always wandering mature males or individuals knocked out of the canopy.

Is Avicularia variegata venomous?

Yes, in the ordinary way that spiders are venomous — the venom subdues insects. It is not considered medically significant to people or pets, and there is no antivenom because none has been required. New World tarantulas as a group carry milder venom than their Old World counterparts, having invested in urticating hairs as their main defence instead.

Those hairs are the genuine hazard. On skin they cause a fierce, persistent itch and a raised rash. In the eye they are worse than uncomfortable: barbed hairs can lodge in the cornea and produce ophthalmia nodosa, a stubborn inflammation reported in the ophthalmology literature that needs an eye specialist rather than pharmacy drops.

Can Avicularia variegata bite?

It can, and bites are rare because everything else comes first. A disturbed pinktoe runs, and if running is not enough it leaps off the branch and lands well clear. Many will fire a jet of faecal fluid at a face that comes too close. A bite happens when the spider is trapped, pinned or held, not when it is merely approached.

Ecological importance and behaviour of Avicularia variegata

The species is a nocturnal ambush predator working a small territory around its retreat. It sits at the tube entrance after dark, reads the vibration of an insect crossing the silk or the leaf it is anchored to, and takes the prey with a short rush and a downward strike. The diet is insects — crickets, moths, beetles, roaches — with a large female occasionally taking a small frog or lizard.

Natural predators: parasitoid spider wasps are the specialist threat. Birds, monkeys, snakes and larger spiders take pinktoes opportunistically, and army ants are a lethal problem for any spider caught outside its tube.

Prey–predator dynamics: living above the ground keeps this spider in a layer of the forest that terrestrial tarantulas never work, so its predation falls on climbing and flying insects rather than litter-dwellers. Its arboreal habit is protection as much as strategy, putting distance between the spider and ground predators.

Seasonal behaviour: females are sedentary, maintain one retreat for years and moult inside it. Males mature at two to three years, leave the tube for good and wander in search of females, which is when they are most exposed and most often seen.

Relationship with humans: in its range this is a harmless forest neighbour that eats insects and avoids people. It is also kept in the exotic pet trade, where the two colour forms make it sought after; pinktoes need a tall, well-ventilated arboreal enclosure, and stagnant damp air rather than low humidity is the classic keeping error. Captive-bred stock is what keeps that interest from translating into pressure on wild populations.

Similar spiders and how to tell them apart

Quick facts

Did you know?

• The name was published in 1896 by Frederick Octavius Pickard-Cambridge, the English arachnologist who also produced much of the spider volume of the Biologia Centrali-Americana.
• For most of the twentieth century variegata was treated as a form or synonym of the common pink toe rather than a species in its own right. The 2017 revision of Avicularia — the same work that moved the Caribbean pinktoes into Caribena and several Brazilian species into Ybyrapora, and synonymised a long list of names published from pet-trade animals — restored order to the genus. Because names in this group have moved so often, the World Spider Catalog is the place to check the current standing of any of them.
• The genus name means "little bird-eater", from Maria Sibylla Merian's 1705 engraving of a tarantula at a hummingbird nest in Suriname. Birds are a rare and opportunistic meal at most.
• The pale toes are dense adhesive pads split into thousands of microscopic tips — the reason a pinktoe can run up a pane of glass.

In summary, Avicularia variegata is a handsome northern pinktoe with two well-known colour forms, a silk tube rather than a web, and the mild, escape-first temperament typical of New World arboreal tarantulas. Watch the hairs on its abdomen, not the fangs.