We are presenting description of each. For those who are only looking for information about the world’s biggest spider, the answer is that it is the bird eating Tarantula.
The Bird Eating Tarantula
It is native to the rain forest regions of northern South America. These spiders can have a leg span of up to 12 inch (30 cm) and can weigh over 6 ounces (170 g). Wild Goliath birdeaters are a deep-burrowing species, found commonly in marshy or swampy areas, usually living in burrows that they have dug or which have been abandoned by other burrowing creatures.
Females always mate, but sometimes may end up eating their mates. Females mature in 3 to 4 years and have an average life span of 15 to 25 years. Males die soon after maturity and have a lifespan of three to six years. Colors range from dark to light brown with faint markings on the legs. Birdeaters have hair on their bodies, abdomens, and legs. The female lays anywhere from 100 to 200 eggs, which hatch into spiderlings within two months.
The Goliath birdeater is fairly harmless to humans, as are most species of tarantulas. Like all tarantulas, they have fangs large enough to break the skin of a human (0.75–1.5 inches or 1.9–3.8 cm). They carry venom in their fangs and have been known to bite when threatened, but the venom is relatively harmless and its effects are comparable to those of a wasp’s sting.
Due to its size, it is also called the goliath bird eating tarantula.
In Brazil the biggest spider is the wandering spider. It can reach a length of 4-5 inches. The name wandering comes from the fact that during night they walk on the jungle floor searching for prey rather than hiding in a burrow waiting for prey to come by.
The raft spider, Dolomedes fimbriatus, is a European spider of the family Pisauridae. The raft spider is one of the two largest spiders in the United Kingdom. Like other Dolomedes spiders it hunts by running on the surface of water, and can submerge altogether to hide from predators.
The female’s body measures up to 22 millimetres (0.87 in) long with a leg span of about 70 mm (2.8 in); as with most spiders the male is considerably smaller.
Raft spiders are semi-aquatic and live around acidic bogs and in wet acidic grassland, especially where there are small pools of water. They are dark chocolate brown in color with a conspicuous white or cream stripe along each side. The closely related great raft spider is similar in size, habits and appearance, but lives in fens.
Golden Orb Weavers
The golden silk orb-weavers are a genus of araneomorph spiders noted for the impressive webs they weave. Nephila consists of numerous individual species found around the world. They are also commonly called golden orb-weavers, giant wood spiders, or banana spiders. In North America, the golden silk orb-weavers are sometimes referred to as writing spiders due to occasional zigzag patterns built into their webs, though these occur much more frequently in the webs of Argiope, such as the St Andrew’s Cross spider. The females usually eat their mate.
The species N. jurassica, which lived about 165 million years ago, had a leg span of some 15 cm, and is the largest known fossilized spider.