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Common backyard spiders.... (click on image for larger view)

Redback Spider
Weight for weight, the redback is Australia's most toxic spider. Since the development of an antivenom in 1956, no-one has died from it's bite.
Length - 10mm

Mouse Spider
It's the strikingly coloured male that's most commonly seen, wondering about during the day in search of females, especially after rain. There are eight species of mouse spider. Bites are common and usually uneventful, but potentially fatal.
Length 15-25mm

Funnel-Web Spider
There are sixteen described species of funnel-web. Although the majority are ground dwelling, some live in trees. While the Sydney funnel-web is Australia's most deadliest spider, 4-5 species are known to be dangerous to humans. Since 1980, when an antivenom was developed, there has been no fatalities.
Length 20-50mm
Wolf Spider
There are more than 120 species of wolf spider in Australia. Nocturnal, ground dwelling spiders, they're swift and agile hunters - their habit of chasing down insect prey gives them their name. Venom mostly uneventful for humans but toxic to small animals and pets.
Length 5-35mm
Whitetailed Spider
Whitetailed spiders usually live beneath bark on eucalypts, but in summer may enter houses, often taking refuge in clothes left on the floor or in drawers.Bite may cause headaches, nausea, chills, blisters and ulcers.
Length 20mm
Golden Orbweaver Spider
There are three species of this harmless spider. Their yellow-gold webs are among the largest of any Australian spider and have been known to catch prey as large as bats and small birds. Unlike many spiders, golden orbweavers their webs intact overnight.
Length 20-45mm 
Bird-Dropping Spider
This sedentary spider feeds at night, almost exclusively on male moths, which it attracts by producing a pheromone that resembles that released by female moths.
Length 12mm

Jumping Spider
The 360 plus species of Australian jumping spider are mostly harmless although one is potentially toxic. The only spiders capable of jumping large distances (up to 20cm), they trail web behind them incase they misjudge the distance.
Length up to 80mm

Black House Spider
These spiders are often found indoors, usually in a secluded spot such as the corner of a window or under eaves .Females tend to spend their entire life s in the same web. While bites are uncommon should be regarded as toxic, especially to children.
Length 18mm
Magnificent Spider
Each night, this spider spins a line of silk about 7cm long with a sticky globule at the end. The spider, producing pheromones similar to those released by a female moth, attracts male moths.
Flower Spider
The flower, or crab spider, sits among the petals of a white or yellow flower, waiting to ambush bees and other insects. The spider remains on the flower until all pollen is gone, then moves to a fresh blossom.
Length 10mm 
Spotted Ground Spider
Female spotted ground spiders are rarely seen away from their burrows, which sometimes features a 'fence' of vertically arranged twigs or leaves. Others are vagrant hunters. The males spend their time hunting for a mate. They're quite timid and reluctant to bite.
Length 20mm
Slater-eating Spider
This species is typically found under logs, old bricks or paving. It prays on slaters. When the female lays her eggs, she seals herself into her silken sack, only emerging when the eggs have hatched and the spiderlings are ready to disperse.
Length 14mm 
Trapdoor Spider
Trapdoors are often mistaken for funnel-webs. There are more than 80 species of trapdoor, most living in burrows. Generally timid, the trapdoor's bite can be painful and cause a severe reaction.
Length to 50mm 
Lynx Spider
Lynx spiders take their name from their cat-like hunting technique, slowly stalking insect prey before pouncing. Day hunters they move through foliage of plants, usually on the top, or wait in ambush areas likely to attract prey.
Length 20mm 
Combfooted Platform Spider
This spider builds it's web in low shrubs. It's retreat, made from leaf detritus, is located at the centre of a series of vertical threads that are spun above a finely meshed silk sheet. Insects fly into the near-invisible threads and are knocked down onto the sheet below. The waiting spider then pounces.
Length 8mm 
Spitting Spider
Mostly found indoors, this species hunts for small insects at night. The spitting spider immobilizes it's prey using a sticky secretion from poison glands. After slowly approaching its victim, the spider stops about a centimetre away and sprays it with a sticky silk, gluing it to the spot.
Length 7mm 
Huntsman
Huntsmen are generally timid and harmless to humans, although a few species have been known to cause brief, but sometimes severe illness. Unusually, females don't behave aggressively towards males, with courtship and mating a tender affair that lasts several hours.
Length 45mm

Leafcurling Spider
The leafcurling spider is so named because of the curled leaves that it typically uses as a retreat. However, the spider has also been observed using bus tickets and snail shells. Females use folded leaves to conceal egg sacs, which they suspend some distance from the main web.
Length 15mm

Spiny Spider
A species of spiny spider was the first Australian arachnid to be documented (collected in Cooktown by botanist Sir Joseph Banks). These spiders often occur in large colonies that can number in the thousands. Their webs are usually built 1-2m off the ground.
Length 6mm

Scorpiontailed Spider
When disturbed, the scorpiontailed spider curls her abdomen over her back like her namesake. There are a number of black lobes on it's tip, but their soft and unable to sting or cause any other sort of wound.
Length 15mm

Netcasting Spider
Netcasting spiders construct a small net using a special coiled, stretchy silk that they hold in their front four legs. Hanging head down they wait for an insect to pass then stretch out the net to snare the victim.
Length 25mm

Water Spider
Although more typically found in creeks and swamps, the water spider is occasionally found in garden ponds. Hairs on the tips of the spiders feet enable it to walk on water, but it can also dive below the surface and swim to catch prey.
Length 30mm

Red-N-Black Spider
During summer, red-n-black spiders leave their webs to search for females. Despite the bright red colour - typically a warning sign - this species is not dangerous to humans.
Length 12mm 
Garden Orbweaver Spider
The garden orbweaver rebuilds its web nightly, emerging at dusk and constructing the web in an hour. At sunrise, it consumes the entire web, with the exception of the anchor lines, which will provide the foundation for the next nights web. The garden orbweaver will bite when disturbed.
Length 20-25mm 
Whip Spider
This spider is an aggressive hunter that attacks large orbweavers. It's often seen on summer nights, waiting above a series of silk threads. When a victim climbs one of these threads, the waiting whip spider uses toothed bristles at the end of it's back legs to pull out a mass of sticky silk with which it entangles it's prey.
Length 20mm 
St Andrew's Cross Spider
None of the 25 species is dangerous to humans but they will bite. These spiders usually build their web a few metres above the ground near waterways. The cross on the web helps attract insects and alerts birds to it's presence.
Length 12-15mm

Tent Spider
The tent spider is named after it's large web that has a diameter of up to 90cm. The web consists of a horizontal orb, shaped like an inverted saucer, that's place amid a large tangle. Tent spiders often form colonies and their combined webs can extend to 4m across.
Length 20mm

Daddy-Longlegs
Perhaps the most common of Australian spiders, the daddy-longlegs has tiny fangs and venom glands that are completely harmeless to humans. The web isn't sticky, acting as a retreat rather than a snare. When disturbed the spider bounces rapidly on it's web, presumably to confuse predators. Many species are found in natural habitats.
Length 9mm

   
       

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