Termites

Due to their diet of wood, many termite species can do great damage to unprotected buildings and other wooden structures. Their habit of remaining concealed often results in their presence being undetected until the timbers are severely damaged and exhibit surface changes. Once termites have entered a building, they do not limit themselves to wood; they also damage paper, cloth, carpets and other cellulosic materials. Particles taken from soft plastics, plaster, rubber, and sealants such as acrylics are often employed in construction.

Bird Lice

Bird lice may feed on feathers, skin and blood. They have no wings, and their biting mouth parts distinguish them from true lice, which suck blood.

Almost all domestic animals are hosts for at least one species of bird louse. Chickens and other poultry are attacked by many kinds of bird lice. Bird lice but usually do not cause much harm to a bird unless it is unusually infested as in the case of birds with damaged bills which cannot preen themselves properly. In such cases, their irritation may cause the bird to damage itself by scratching.

Rats & Mice

Rats and mice can at times be harmful rodents, damaging and eating crops, causing structural damages and spreading diseases through their parasites and feces.  In some locations, breathing dust that has come in contact with mouse excrements has been linked to hantavirus; which may lead to Hantavirus Pulmonary Syndrome (HPS). Primarily nocturnal animals, mice compensate for their poor eyesight with a keen sense of hearing, and rely especially on their sense of smell to locate food and avoid predators

Spiders

A common household pest on the Central Coast is the Sydney funnel-web spider Atrax robustus. Sydney funnel-webs are medium-to-large in size, with a body length ranging from 2 cm to 7 cm (0.9" to 3"). They are glossy and darkly coloured, ranging from blue-black to black to brown or dark-plum coloured. The carapace covering the cephalothorax is almost hairless and so appears smooth and glossy. Males are smaller than females. The spider can be very aggressive when provoked. The long-lived female funnel-webs spend most of the time in their silk-lined tubular burrow retreats. Males, recognized by the modified terminal segment of the pulp, tend to wander during the warmer months of the year looking for receptive females. They are attracted to water and hence are often found in swimming pools where they have fallen while wandering. The spiders can survive such immersion for up to twenty-four hours and can deliver a bite when removed from the water.

They are mostly terrestrial spiders, favouring habitat with moist sand and clays. They typically build silk-lined tubular burrow retreats with collapsed "tunnels" or open "funnel" entrances from which irregular trip lines radiate out over the ground. In some exceptions, which lack trip lines but may have trapdoors, the silk entrance tube may be split into two openings, in a Y or T form. The burrow may be in the hollow of a tree trunk or limb, many meters above ground level.

Fleas

Fleas are wingless insects with mouthparts adapted for piercing skin and sucking blood. Fleas are external parasites and live off the blood of mammals (including humans) and birds.). The flea life cycle begins when the female lays after feeding. Adult fleas must feed on blood before they can become capable of reproduction. Eggs are laid in batches of up to 20 or so, usually on the host itself, which easily roll onto the ground. As such, areas where the host rests and sleeps become one of the primary habitats of eggs and developing fleas. The eggs take around two days to two weeks to hatch. 

Wasps

The type of nest produced by wasps can depend on the species and location. Many social wasps produce paper pulp nests on trees, in attics, holes in the ground or other such sheltered areas with access to the outdoors. By contrast solitary wasps are generally parasitic or predatory and only the latter build nests at all. Many wasps create a paper-like substance primarily from wood pulp. Wood fibers are gathered locally from weathered wood, softened by chewing and mixing with saliva. The pulp is then used to make combs with cells for brood rearing. More commonly, nests are simply burrows excavated in a substrate (usually the soil, but also plant stems), or, if constructed, they are constructed from mud.

Bees

Bees are flying insects closely related to wasps and ants. Best known for their role in pollination and for producing honey and beeswax. There are nearly 20,000 known species of bees in seven to nine recognized families, though many are undescribed and the actual number is probably higher. They are found on every continent except Antarctica, in every habitat on the planet that contains insect-pollinated flowering plants

Ants

Ants classified as pests include the pavement ant, sugar ant  the odorous house ant and the European fire ant. Populations are controlled using insecticide baits, either in granule or liquid formulations. Bait is gathered by the ants as food and brought back to the nest where the poison is inadvertently spread to other colony members through trophallaxis. Boris acid and borax are often used as insecticides  and are relatively that are relatively safe for humans. Bait may be broadcast over a large area to control species like the red fire ant that occupy large areas.

Cockroaches

Cockroaches are one of the most commonly noted household pest insects. They feed on human and pet food, and can leave an offensive odour. They can also passively transport microbes on their body surfaces including those that are potentially dangerous to humans, particularly in environments such as hospitals. Cockroaches have been shown to be linked with allergic reactions in humans. One of the proteins that triggers allergic reactions has been identified as tropomyosin. These allergens have also been found to be linked with asthma.

Above information sourced from www.wikipedia.org